In Silent Hill 2,
you walk in on Pyramid Head (for the sake of the children im just gonna say) Doing his thing.. James flees to the closet. While staring out at Pyramid Head,Petrified, he turns to see you glancing at him. He then drops what hes doing, and begins to walk towards you...

GoddamnitReddas:

Lord_Ascendant:

That and Episode 2 watching Eli die, ooooooooooooooh that Advisor's gonna get a face-full of bullets.

YES.
I spoiled it by accident a little bit, but it was just 'Eli dies'. I thought I would be okay with that.
But then I saw it happen.
Jeezis Christ. Goddamnit, I LIKED him.

Advisors are going to get a face full of ROCKETS from me.

Doom 3. All of it. Especially that "mirror" bit.

in dead rising when you go up against the crazy clown with chainsaws definitely an "oh shit" moment.

When you're at a LAN Party, focused entirely on the game, headphones on, and face half a foot from the screen, then BOOM! shotgun to the back of the head. If nothing else, it startles me half to death.
Crisis Core. Minerva. Enough said.
When you're exploring a map and unknowingly stumble across a boss battle... at half health... and low on health pots.

Playing in the final of a CoD 4 tournament, against one of europe's better team, and you need to win that round to stay in the game. To hear the commander say: "Your the last one, complete the mission" is a very nervewrecking sentence, to say the least.

Hearing the ominous rattle of Steven's war trolley as you are about to enter the pharmacy in Seon's Food and Stuff {Dead Rising}.

Pretty much all of the first Resident Evil remake, in particular when I was casually strolling down a corridor and about 4 zombies dive through the windows. Bricks were well and truly shat.

Edit: Also doing the last level of Halo 3 on co-op online with some friends. When you make a last ditch warthog jump off a collapsing forerunner platform and see one of your friends sail over your head in another hog, that's also a bit of a "oh...shit" moment (but half because it looks so dam cool lol).

The Shalebridge Cradle from Thief: Deadly Shadows. The first time I played that level I ended up losing sleep because those bloody Puppets would come at me in my dreams, and I obsessed about being too scared to play it at night. It's not the same the second time round (nothing ever really is) but that first time, well...

Playing Bioshock and when you go over to a creepy mask and a splicer dropes a decoy behind you and makes a realy scary shadow. That scared the Sh*t out of me.

When you enter Ravenholm on HL2, and hear the moans of those faster zombies. (I forget the technical term >_>) After reading the 'Concerned' webcomic, I knew that that meant, and actually exclaimed, 'oh....shit'.

There are many moments on Halo when the room has been clear, then I turn around and there's a gang of flood running towards me, when I have no ammo, or a shotgun that needs reloading.

Condemned scared the crap out of me when I realised how fast the homeless guys came running at you.

xxhazyshadowsxx:
In Silent Hill 2,
you walk in on Pyramid Head (for the sake of the children im just gonna say) Doing his thing.. James flees to the closet. While staring out at Pyramid Head,Petrified, he turns to see you glancing at him. He then drops what hes doing, and begins to walk towards you...

So scary you signed up to tell your tale.

I have to say, that bit was shit-scary.

Resistance205:
in dead rising when you go up against the crazy clown with chainsaws definitely an "oh shit" moment.

Or the tank at the end. How was that supposed to be even close to fair?

When that berserker burst the wall (first time) and then killed the no name guy in gears.

Playing rainbow six vegas on Terrorist hunt, and having one open a door right behind you, screaming "YOU DIE ****"

Oh God, Shalebridge Cradle...
[shudders]

Man that place was creepy. Of course it's not so scary the second time, not just because you know what IS there but because you know what's NOT there (which I feared leaping out at me a good long while until I figured out what was going on). Also, the Lost Cathedral in Thief 1, done by the same guy. The whole level... just... wow...

Also seconding the Resident Evil remake.

That point in FEAR (even in the demo) when Alma appears and you're helpless on the ladder. I half leapt out of my skin.

Hopping into one of those coffin things in HL2, when you just KNOW it's going to render you helpless.

My first Juggernaut in Marathon (I later took to punching them to death, just because I could - yes, I know they fly).

The appearance of the final boss in Aquanox ("What in the name of the Devil is that?" CHOMP).

My first efreet and Hakai in Exile 2.

Getting to a new area in La Mulana and suddenly realising "There are HOW MANY of these?"

That'll do. The more I put the less "most" they become.

i remember the first time i played gears of war with my friend

one word

beserker

i fucking hated the beserker!!!

Hmmm...when G bursts out of Chief Irons chest in Resident Evil 2 (even though I did feel somewhat more sorry about it when it happened to Ben the reporter since the chief did in fact have it coming)

Every single cutscene in MGS 4

Let's see...

CS:S Pulling the pin on a grenade and then having someone pop up in front of you with an AK-47.

TF2 Anything with pyros, and hearing an enemy medic yell out, "I'm fully charged!"

Half-life 2 (and all episodes) Hearing the poison headcrab's little "Rofl u r ded" screech, the when a certain character died, when you're saving Alyx and then out pops the G-Man.

Warcraft III The Frozen Throne-Trying to turtle and then realizing your enemies are all ghoul-rushing.

Settlers: Rise of an Empire: "A stonecutter can't find any stone!" <---that was just-kidding.

Battlefield 2142-Being out in the open and then hearing a near-miss by a sniper, capturing a silo/CP and hearing the loud footsteps of a Battlewalker, being in/piloting an air transport and hearing the "Rofl u r ded" sirens blaring, signaling you've been spotted by a gunship, blowing up commander assets and then looking up to see a titan gun swivel at your face, Being in a vehicle then getting EMP striked, because you just know there's going to be a lot of explosions soon.

Portal: The "end" of the test, the final boss battle.

Morrowind: When you first start out and you realize that you can't kill a little worm no matter how hard you try.

Every other second of Bioshock.

In DOW: Dark Crusade, seeing a champion of a tiny chaos cultist squad start floating in the air, only to be smashed into the ground for the summoning of a Bloodthirster.

There be Spoilers ahead.

Freespace 2, when you go on the secret mission in a Shivan figher in to Shivan space only to find out that they have an entire FLEET of Colossus sized destroyers.

COD4 - many moments. The nuke of coarse. When dude launches 2 missiles and you see them go up. And then ending, when you think all is lost, Price slides you his gun - awesome.

Ninga Gaiden 2. Killing the last boss, using every healing item to do it, only to realize you have to fight him twice. I cussed, I cried, I died. I eventually kicked his ass, but that was an oh shit moment.

RE4 - seeing Sadler "transform" into that grose spiderthingy, then the oh shit goes away when you realize he is a wuss.

Guitar hero 3 - the song you play during the credits. My fingers still hurt.

shadowfire44:

FEAR: Playing it when I was 8 not realizing what the game was about...

FEAR: At one point (Back when I was 8), I was walking through some water (About waist high or something like that) and than one of those horror, changes to creepy stuff and people disintegrate thingies, happened and the water changed to blood and than I continued walking to the door and this skeleton, zombie, thing, just jumped up out of the water and attacked me and I freaked out and ran out of my room.

Ah yeah, because FEAR was out since 2000 huh? ... Noob.

Bioshock: "Niiiice work.... boyo," with his accent failing? Hell yeah. I mean, you know what happened, but losing his Irish lilt to Chicago mobster's voice really cemented the "I'm screwed" feeling.

Screaming Mantis. Its been a while since I've had such a "What the hell do I do now??!!" moment, until I realized I could use the syringe.

Portal: "You just destroyed my morality core. *giggle*"

Resident Evil 3. the first time outside the police station when Brad was killed and i was face to face with Nemesis, and had to make the choice to stay or run while he walked up to Jill.

I usually have a more "fuck it..." attitude when gaming on Halo however not in the sense of giving up but having to do everything myself. I recall back in Halo 2 trying to get my team organized to steal the flag. I kept telling them rushing one by one was not going to work, especially since they tried that for half the bloody round and died every time. So I got fed up said "fuck it, I'll do it myself", loaded up the shotgun and snuck into the enemy base, popped two guys with SG, stole the flag, beat a third guy with it and tossed it so I could blast the final guy with the shotgun before finally scoring.

... my team then processed to brag in the lobby <.< (Until I told them to shut up as they all sucked, considering I did everything)

And it baffles people why I sometimes hate humanity.

In Bioshock, when that guy gets killed by the female splicer, and she turns towards me in the bathysphere... That was an "ooh... shit" moment for me.

How about Half-Life 2 episode two when the Hunters are introduced? Every little glimpse of them, on the roof, through the dirty window, and then finally when it ruined Alyx's shit..... each one was a great "Jesus baby-eating Christ!" moment.

ARMORED CORE 3
When my friend and i were playing Armored Core 3 and we first shot at each other with the Linear Cannon. OMG has anyone ever seen a freight train fly through the air? it's pretty much that, but made out of blue-white-hot energy and a deafening thunderclap. fucking scary, especially as it flies past your AC forcing it heat up by 100 degrees, and making your controller shake.

MGS2
I was half asleep, starving, and it was 3AM (due to game marathon) and Colonel Campbell fucking told me to turn off my ps2! as it was my first MGS game i wasn't sure what to expect from this game, and so ABSOLUTELY PANICKED, i sprung out of my bed, crashed into my tv stand to hit and hold the reset button.

Salihcin:
i remember the first time i played gears of war with my friend

one word

beserker

i fucking hated the beserker!!!

Me and my mate loved it, we tauned in and ran around letting it chase us good times =D

My Resident evil 4 experience:

I'm almost out of ammo in a rundown house. I then go to the door to leave, and as I open the door...I hear the sound of a Chainsaw starting. I didn't have a second thought as I turned Leon around and high tailed it right back in to the house.

It didn't do much cause a few minutes later a guy, chainsaw in hand and a bag over his head ran in and decapitated me...

Scared the crap out of me...

When, in SSB, you've exhausted your up-B or something similar and are falling helplessly back towards the stage only to realize that Ike (or whatever) is there waiting for you with a huge heaping helping of your demise.