Need for Speed: Carbon. Friend of mine and I had a competition going to see who could get the best cop chases (most number of cars for longest time). Get up to 18 minutes and ~120 cop cars on me, been pulling off all these really fancy manoeuvres dodging the big 4x4's and the corvettes, spike strips, the works.

Cruise into a tunnel to dodge a road block and as I'm entering clip one wall. That split second caused 30+ cop cars to ram me straight through the tunnel and out onto the road again - facing the right way.

We just sat there going "Whhaaaaaattt the?!" - and then I got caught :(

infection in halo 3
i was the last man standing, i got a turret and start screaming and shooting ALA scarface style.
i took 7 down before i got cut :P

playing cod4 crash mission, private game, one friend against me and another mate. we where on top of the tall building and the guy we're playing trys sneaking to the helicopter. headshot. and this is when its gets memorable. i figured he would spawn up by the garage and would go down the stairs to the blue building, so i arced a grenade way over there. killed him. and just to explain my mate hates grenades in cod4 so we knew he was currently swearing, a lot. so we started just lobbing grenades all over, having the 3x frag skill set. and when we ran out of grenades just suiciding off the side of the building while the other was throwing his grenade. we killed him about 8 times using this method. ending the match. we were in absolute tears laughing at how pissed of we knew he was getting.

Playing BF1942.

My friends and I would sometimes get bored of playing the game correctly and just arc off from our team and do stupid stuff. One of the things we used to do is pick engineer classes because they could throw down multiple bundles of dynamite and remotely set them off...which would generally equal massive explosions that would rocket us into the air.

I have pictures of my viewpoint being 100 feet off the ground with my friend below me, pictures of soaring high over an intense fight, but the greatest moment was when I was playing and a friend of mine (who wasn't screwing around) caught me in the act. He was actually the one who took the picture, which consisted of my soldier having this crazy look on his face standing over five bundles of dynamite and his plunger out.

rubs: ":l"
me: ":l"
me: "you might want to step back"

Also, I used to jump onto the wings of airplanes as they took off and lie prone. I'd always end up falling off the wing some 300-400 feet off the ground, but I would make it pretty far most of the time.

Halo 3, Big Team Slayer on Valhalla. I'm in a Banshee when I hear the beeping of missile lock. I boost straight towards the other team's flying Banshee and I bail. They collide just as the missiles hit, giving me the kill. As I fall through the air, a friendly Mongoose drives striaght for me and I hit RB at the perfect right time to get on the back seat and we drive to safety.

Cod3 I was on the level the Island I found the Kar98 with a scope I shot 1 bullet that killed 3 jerries.

I'm not sure if MSTing Kingdom Hearts II and Persona 3 count, so let's go with the first time I played Disgaea. I sortie with three Prinnies and pick one up for a lark. Two others are flanking Mid-Boss and we're getting our asses kicked, so I throw the last one to try to get a three-Prinnie pincer. He blows up, triggering the other Prinnies to explode and take a good chunk of Mid-Boss's health away.

Needless to say, I laugh my arse off.

Wargamer:
Ooh, just remembered another!

Sniper Elite - I blew up a tank with a Sniper Rifle on one of the last levels... from nearly 300 metres away!

Consider that the only way to do that is to shoot the fuel-cap, which itself is about two inches in diameter.

2" wide target from 300-odd Metres. Beautiful.

NIFTY!! did you have Gravity/Wind on?

Not realizing a mob had cast Iron Maiden on my assassin in Diablo 2 then watching her explode when I touched something.

in Oblivion, I was taking Jaufree and Martin to Cloud Ruler temple and we were attacked by a bandit. I decide to let them fight him and just watch from the side. For some reason, after they kill the bandit, Martin and Jaufree start fighting each other and keep at it until Jaufree "dies". of course he gets up a few moments later and they resume standing there and looking at me.

Also, in GRAW, Bo Jenkins the grenadier CONSTANTLY blew up our whole squad with a really badly launched grenade in the campaign. so now my gamer friends and I use "bo jenkins" to refer to any AI that does something really stupid with explosives

Earlier today halo 3 some guys infection gametype "Predator" which is an alpha zombie (the predator) vs the players and there is only one life so you win by killing the predator and vice versa.

Anyway i was it and leaping around on the specially designed map killing of the strays but alas two left back to back ontop of crates in an open area. So i jump as close as i can without being seen(i also have good camo) then i leap at my friends brother who is facing the other way slash him and slash the second before he gets a shot off.

One time me and my tech camp buddies decided we wanted to commit virtual suicide and all nine of us set the Warcraft 3 computer to "Insane" difficulty. In the middle of our epic showdown between armies, one teammate was making Yo Momma jokes in the chat.

It's hard to direct your Dragonhawk riders when "Yo Momma's so fat even Naruto can't believe it!" keeps appearing on the screen.

Playing Call of Duty 4 on Backlot, 180º midair M9 headshot for the airstrike.

Also, playing Halo CE during Assault on the Control Room, throw a grenade near an Elite on a bridge and they sometimes fall off trying to dodge it. Also this was pretty funny: http://youtube.com/watch?v=eHmJ4Pbfs9g (I'm the one with the laser)

Another time I was playing Gears of War online and one of my teammates had a boomshot. He was fighting one enemy on the other side of the map from me. I heard an explosion and next thing I knew I dismembered hand hit me on the head.

Also once I was playing an SSBB stock match and me and the other player were both down to our last lives. The other player was Samus and got a final smash. Once I dodged the blast the other player threw a piece of Samus's armour at me. I (Falco) reflected it back and killed him for the win.

One of my favourites is actually in Call of Duty (1) of all things... on a level (I don't remember which one) where most of my allies had died and I held off some 40-50 enemies all by myself, with nothing but a bolt action rifle and 2 mags. I never got so many headshots :p

in metroid prime 3 the Ice guy (sorry I just beat him and I already forgot his name) instead of shooting and rideing around like Ice man just stops and lets me kill him.

also when I was playing brawl I was ganondorf and I was elbowing link (my cousin) when he activated his final smash, It started but instead of me being trapped in the attack the elbow went through and killed link

Alright, this wasn't one of my shining moments of being a human being but I feel it must be shared.

So I finished Oblivion and decided each day I would scour the Oblivion world for random quests and stuff I could use in alchemy'n'what not. Well, I stumble upon this man kneeling in front of a tombstone. So naturally I offer my aid with something. I can't quite remember the quest, but it was something like retrieving a memento of his wife. I did the quest and brought the item back, accepted my reward and then something came over me as I saw him kneel back down over the tombstone. My roommate was watching in horror as I set an arrow in my bow and pulled it back. I got nice and close behind the NPC and shot the man point blank through the back of his skull. His head slammed into the tombstone of his loved one. His head was turned to the side afterwards clearly displaying the arrow that felled him along with his body propped against the tombstone, lifeless. There was also a nice blood splash on the rock as well. I nearly died from laughter, and my roommate left the room shaking his head.

Now I know why bad things happen to me EYEAREELL.

In Garry's Mod forgetting I bound numpad '+' to a thruster. I was walking innocently enough, activated a camera I set up and was promptly hit by a train spinning wildly.

Killing the second player in Halo for more ammunition for the rifle when playing on legendary.

Playing star wars galaxy, I was the last man standing in my army and there was over 70 com controlled characters alive, I had the missile launcher and was down to my pistol at the point I realized I was all there was on my team.

Two recent Halo 3 LAN memories.
Infection on Isolation, with about 14 players. I had grabbed the sniper rifle. Many chose the dumb option and ran around like lunatics (it can be fun, I admit) but there was a solid core of people who stood at the top platform and carefully scanned the hill below. Initially, we wiped the floor with the zombie pest as it charged upwards to us. However, with the crazed loons all mopped up the zombies had grown in number. The momentum shifted so suddenly I was shocked. Paraphrasing of my yelling at the time:
"There's one to the left...no two...three-four! Fucking hell there's fi-HOLY JESUS SIX ZOMBIES TO THE LEFT!"
I set to mowing them down with my sniper rifle and though I did well a combination of the rifle's low clip size and my utter panic saved a couple. Out came the shotgun as I waited for their inevitable rush at our fortress.
The right side of the hill wasn't doing too well, either. Though it had fewer zombies, most of our defenders had defended the larger left side push, and there was no sniper rifle to cut them down quickly.
The fight went from frenzied rifle fire to a bout of liberal grenade use as the zombies used cover to shield their last few seconds on the hill, and then quickly became a terrifying shotgun-sword duel. Our squad of six took down as many incoming zombies at the base of our parapets, but the zombies were suddenly inside our defences, hacking and dying in what seemed a lethal game of tag. A human shot a leaping zombie as he was sworded from the side by another zombie, which was instantly annihilated by the last two survivors, which became just me, who killed the last zombie of the rush with a bulltrue.
I had only a couple of seconds to be triumphant; more zombies had trickled through our shattered defences and were almost within lunge range already. I took the only remaining option: I leapt into the downward tube that led to the underground level. I commandeered a Mongoose and with a scream of "You'll never take me alive!" began hooning around the map (it seemed like the right thing to say at the time). In the end I was killed very anti-climactically, but that feeling as we defended the upper platform was what I'd been playing Zombies, and then Infection, for over 2 or so years- it was the first time Zombies really felt like fighting a zombie horde.

This is one of those "you had to be there" moments but I'll give it a shot. We were watching a Duel between two players, both of whom had established themselves as the craftiest and most devious of the group. The game had been very slow-paced with short bursts of intense and cerebral action. With ten seconds to go the scores were 3-4 and the 3 player suddenly appeared within striking distance. With a shotgun. He charged forward behind the cover of a shield door which protected him from death by any weapon 4 had. Just as 3 was in range, we all heard a "CHINK" and saw a yellow glowing on 3's helmet. 4 died to a shotgun burst: 4-4. Suddenly, he blew up and the room exploded. We were all crazily excited by this very fitting end to what was the best match of the LAN.

Goldeneye 64: Setting - Facility, Assault Weapons(?)

So my friend has locked himself inside a toilet, and every time I try and open the door, he closes it again. I try every way possible of shooting him, but eventually run out of ammo.

I'm like "Right, I'm off to get more ammo, you sneaky bastard."

So I ran as if to run out of the door. Problem is, he chooses this ammo-less moment to break loose and try and gun me down.

I turn, and unleash my last weapon: A THROWING KNIFE.

The rest is gaming history in my house, as he runs out of the toilet and turns to face me, his screen is basically filled with throwing knife as I get the luckiest headshot I'll probably ever get.

Cod4
Search and Destroy
Downpour

It's 3 - 3
so final round and me and my team are attacking
As we make the uphill struggle against MG fire
I manage to get into position and headshot the guy on the MG
Literally seconds after that a hail of grenades fall all around me and my teammates
Killing all but me (Turns out their whole team had Fragx3)
So it's one vs 5 and im a sniper, I manage to pick one guy off
and I make a desperate run to pick up his mp5
suprisingly im unseen and hiding behind the tanker by the shed in
the middle of the map.
As im prone and waiting for someone to go by I hear two very loud metallic thuds.
Two enemies jumped from the roof onto the tanker and both start to look ahead completely oblivious to me, so I shoot them both but sadly no silencer on the mp5 and out of ammo
I pick up a silenced usp.45 that dropped from one of the guys on the tanker and make a move
I am instantly met by an enemy with a p90 :(

By some divine karma i manage to go prone in time as bullets whizz above my head
and take him out with the pistol
Start to reload my gun and another guy strafes round the corner,
I throw a flashbang in his direction then run away to their end of the map.
Dazed and confused the final enemy heads towards our spawn thinking i've retreated
I get on top of the metal shack jump down and knife him whilst still in the air.
Everyone in the room went nuts apart from the guy on the other team who i stabbed
even though had been giving me shit all throughout the game.
*smugsmugsmug*

I can't think of anything epic now...but something does spring to mind.

I was playing 2fort on team fortress 2. I decided to give demoman a shot. I respawned, ran out of the fort and across the bridge. There was no one around. I pulled out my sticky laucher and placed one at the base of the door, intending to blash jump up to the floor above. But the sticky just went straight though the floor. I fired a few more stickys, and they all phased though. I set them off, and though I could hear the explosion, nothing happened. I switched to genade launcher, puzzled, and fired my gun into the air...apoun which there was an explosion of blood. It was awesome. A spy had jumped down from the top floor just as I'd fired the gun, and the genade and spy met in mid air. I lol'd

Another time, I was playing scout. I ran into the oppisite teams intelligent room, grabed the case and mad a dash for it. I took the left turn towards the court yard. I ran straight up the stairs and though myself though the door. As I did so I realised with horror that there was a sentry set up right next to me as I came though the door. I brased myself for the impact...And the sentry expoloded. The engineer obviously thought he wasn't getting any kills there and had destroyed it just as I appeared. I lol'd again.

I was playing Halo 2 with four friends on two xboxes at a LAN of sorts and the dipshit next to me pulls his controller out. This pops up the ERROR screen, but the background is sort of visible around it. I'm on his splitscreen, of course, so I can't see jack bollocks, so I randomly start firing my shotgun. I hear DOUBLE KILL just a few seconds later, followed shortly by "HOW THE FUCK DID YOU DO THAT." I never let them live that down, oh no.

I sunk a 3 pointer from under my own hoop after the hooter to take a play off final into overtime in NBA2K on the Dreamcast.
Spent the next two hours trying to work out a way to record the replay.

I had a clear screen with about 6 lines to go to beat my high score on Tetris (still 188 lines) on the Gameboy when my girlfriend of the time decided to distract me.
Girlfriend 1 - Tetris 0

There was another time with the same girlfriend an imported Rez peripheral - you can fill in the blanks for yourself on that one.