I don't want to sound like an ass but Worms 4:Mayhem actually had custom weapons and to be honest they sucked.

If a developer put custom weapons into a game they'd have to put restrictions on them rendering them pretty much pointless.

The_root_of_all_evil:
The P.O.V. gun from Hitchhikers.

Once fired, it gives the victim a total awareness of how you see things.

I'd just tape the trigger closed.

Read. The. Books. Now.

The Muffin Gun! Comes in Blueberry or Poppyseed. The only problem would be eating the ammo...

A gun that pins people to walls with their own spinal cords. It shall be known as the Spinal Tap.

A gun/item that, when you are shot/stabbed/damaged, causes a temporal warp and creates a pie right where your foes face was when they struck the blow.

A fantastic shiny spoon of lightning death +2!

Shadow gun, Once it hits your shadow, your body is dragged by it.
Ex:You can crush people on walls.

I would make a weapon that randomly fires out other weapons. You might fire a knife at someone and stab them, or even fire another gun that slaps em in the face and shoots them in the shins when it hits the ground. And I'd also sell an attachment that makes it so it fires objects other than weapons, things like pens, chairs, maybe even koala bears...

The greatest weapon already exists.

The Sandvich. Bar NONE.

Random argument man:
Shadow gun, Once it hits your shadow, your body is dragged by it.
Ex:You can crush people on walls.

Reminds me of what Vamp did in Metal Gear Solid 2. He would throw knives that would pin your shadow to the ground, meaning your unable to move. You'd have to shoot out the lights to free yourself.

Aries_Split:
The greatest weapon already exists.

The Sandvich. Bar NONE.

It's not exactly a weapon, seeing as how you can't hurt anyone with it.
Check mate, I believe.

Anyway, the best possible weapon would be some kind of shotgun, with the pellets in each shot replaced with shards of crystal.

200 round chain gun with acid bullets that burns through the enemys skin making them in pain and agony for at least 5 seconds until their heads explode with Stock and laser sight with 3 round mounted rocket launcher to blow the hell outta tanks and choppers and for added fun a harpoon gun on the side that lights the enemys on fire burning them from the inside-out 2 seconds after contact.

Geo Da Sponge:

Aries_Split:
The greatest weapon already exists.

The Sandvich. Bar NONE.

It's not exactly a weapon, seeing as how you can't hurt anyone with it.
Check mate, I believe.

Anyway, the best possible weapon would be some kind of shotgun, with the pellets in each shot replaced with shards of crystal.

If it augments your ability in combat, I consider it a weapon.

Cheesus333:
4 feet? Seriously? That's quite far for a shell to detonate

Far from what? The target? Shotguns are accurate enough for a four foot shot. Go out to a firing range and shoot a target four feet away. See if anything hits.

Geo Da Sponge:

Anyway, the best possible weapon would be some kind of shotgun, with the pellets in each shot replaced with shards of crystal.

You mean like the Shard Reaper from R&CF:ToD?

The best weapon in existence has already been made, but it is not the sandvich. It is the swarm plasmid. As Yahtzee once said:

Yahtzee:
"But all of this is countered by the fact that he has a magical hand that shoots bees, and that's why he takes the prize. Because no matter who you are, the moment you're compared to a magical hand that shoots bees you're going to fucking lose."
-Yahtzee Goes To GDC, Year's Best Nameless Voiceless Dork Award

Michael_McCloud:

Geo Da Sponge:

Anyway, the best possible weapon would be some kind of shotgun, with the pellets in each shot replaced with shards of crystal.

You mean like the Shard Reaper from R&CF:ToD?

Shut up. You're ruining it for me. Although, I don't have a clue what R&CF:ToD stands for...

A device that shoots audio frequencies so disruptive to the victim's aural functions that it causes thier brain to explode from shock.

Oh, wait... http://www.wegame.com/watch/Doom_Rickroller/

Geo Da Sponge:

Michael_McCloud:

Geo Da Sponge:

Anyway, the best possible weapon would be some kind of shotgun, with the pellets in each shot replaced with shards of crystal.

You mean like the Shard Reaper from R&CF:ToD?

Shut up. You're ruining it for me. Although, I don't have a clue what R&CF:ToD stands for...

Rachet and Clank, Tools of Destruction. One of the greatest platformers released.

JOE COOL:
200 round chain gun with acid bullets that burns through the enemys skin making them in pain and agony for at least 5 seconds until their heads explode with Stock and laser sight with 3 round mounted rocket launcher to blow the hell outta tanks and choppers and for added fun a harpoon gun on the side that lights the enemys on fire burning them from the inside-out 2 seconds after contact.

Wow, looking back mine is pretty gory.

Asday:
A pistol made of wheat.

The most useless weapon ever.

Solely for use as an insult, as in, when you kill someone with it (good luck), you're either ridiculously leet, or they're the opposite.

Or both.

But think of all the celiac noobs you could give horrible stomach and conveniently incapacitating stomach aches to! You could rule!!! (as long as you had something to kill them with as they writhe around in pain)

As for my weapon it would be a mine that when activated would make the player fall into a pit just a bit to high to jump or climb out of.

Aries_Split:
Rachet and Clank, Tools of Destruction. One of the greatest platformers released.

Thought so, but the extra 'F' threw me off somewhat.

Aries_Split:
One of the greatest platformers released.

Agreed, though I've got to say that Shadow of the Colossus takes the platformer cake. I'm off topic, however.

As for an original weapon, I'm going with a marble. An ordinary marble. You have no idea how much carnage they can cause when used correctly.

And the extra F is for Future. It's Ratchet and Clank Future: Tools of Destruction.

I'm picky and evil, I know.

I would create a sniper rifle. BUT, not just any sniper rifle.
I would create a sniper rifle that, when aimed and fired at the ground, fires a thermo-molecular dart that some how creates an earthquake. Then that earthquake would somehow create a volcano.
So, basically I would create a sniper rifle that fires volcanoes.

Alas, as Yahtzee has taught us Painkiller has already made the best weapon ever- one that shoots Shurikens and Lightning.

However if I was to put serious effort (and by serious effort I mean be a know-it-all jackass) I would point out that military philosophers have for ages dictated that the finest strategy is the one that avoids combat inteirly. Thus, the finest weapon one could create is something that erases the desire for violence as well as creating a sense of mutual like and brotherly comraderie that promotes wellbeing and cooperation. Such a weapon does exist and it has been in mass production for centuries.

The Bong.

Go take a hit and tell me i'm wrong.

Minigun/flame thrower.

bodyklok:
Minigun/flame thrower.

That would need a liquid nitrogen cooling system

Altorin:

bodyklok:
Minigun/flame thrower.

That would need a liquid nitrogen cooling system

Excellent, it can double (triple?) as an Ice thrower!

A Flechette gun that shoots dual-pronged darts. Think unlimited range Death-Taser without cables.
-or-
The Solar Gun from MGS4 implemented into more video games.

The Hug-Gun. Gives the enemy a nice reassuring squeeze before shooting them in the back of the face. (Yes, back of the face.)
Complete with gigantic Mickey Mouse-style glove hands.

A weapon that shoots circular saws and fire. It's the only thing I can think of that can top shurikens and lightening.

"Lethal Itching Powder" Instead of a claymore firing shrapnel it explodes an itching powder so potent it causes it's victims to scratch their own skin off.

"The Chuck Norris" An incredibly large powerful looking bazooka type thing that looks amazing, however all it does is tell Chuck Norris jokes to piss the enemy off till they quit.

"The RPG" [Retard Pwning Gun] A sniper that fires high velocity, armour piercing, Retard seeking "Your mom" insults at the mouthy douchebags that online gaming can do without.

The Shocket Launcher:
A small explosive pellet firing gun that works like a shotgun.

The Hammer:
A sniper rifle that fires long metal spikes.

The Reaper Revised:
A war scythe that has a chainsaw end, too long to be a chainsaw just long enough to be a scythe.

The Priest of Hate:
A shotgun that fires pellets full of potent acid.

The Light Of Belief:
Crucifix axe. Very big weapon, used with terms like burn the heretic.

meatloaf231:

Cheesus333:
4 feet? Seriously? That's quite far for a shell to detonate

Far from what? The target? Shotguns are accurate enough for a four foot shot. Go out to a firing range and shoot a target four feet away. See if anything hits.

You said that the shells explode. If I had an explosive of some sort, I would want it to blow up in my enemiy's face, rather than four feet away. Sure the shrapnel would still kill them, but to be on the safe side I would blow it up closer.

Any of these'll do. Especially that last list.

A weapon that would shoot a deadly parasite into people. It causes the person to become some mad animal, thus slaying everything around him, then at the end a tone of biological abominations hatch from his flesh.

A weapon that spins blades around a lot like the Painkiller. It starts off as an arrow with the blades inside, once impacted, the blades will shred the person from the inside out.

A device that will release tons and tons of compressed explosive gas in the form of Myst. once enough is spread around, ignite!

A super soaker that shoots hot lava.

A whip with light metal needles on them so it'll really hurt the enemy. It's partially automated like a snake to it can do things like wrap around the enemy... and engulf him

For a fighter jet, A missile that latches onto a plane, locks the controls, then makes it suicide bomb something.

You know those little energy balls from Half-Life? A frag grenade that launches mini sized versions of those (bounce, bounce, bounce).

Banhammer & nerf stick

A giant stereo system: that blast bad music

rat flail or a machine gun with a train on it! seriously, I want some of those!

A high velocity baby launcher. How is that useful? hell if I knew, I just want to launch baby's.

A gun that shoots out smaller guns which shoot out even smaller guns, which shoot bullets

that's like, a lot of bullets.

OH WAIT

how about a gun that shoots lots of bullets

yeah. that's genius

meatloaf231:
"Jar of Bees"
Pretty self explanatory. Still want to see it in a game though.

"Octopus Launcher"
Also self explanatory. Launches aquatic invertebrates of any kind at high speeds.

Play dead rising, theres a bee in a jar, then when you throw it, make all the zombies heads explode. :)

Have fun.

A gun that shoots puppies at people, instantly making them want to put down their guns and have a group hug. But in case someone is too evil or too much of a dickhead to do this, the puppies also explode with the explosive power of 100kilos of TNT. Now imagine what that would sound like being fired...