A gun that fires the "brown note", the sound that makes people shit themselves, so its basically a speaker firing soundwaves accurately enough to not effect the user. FYI, I found the brown note when Celine Dion came on the radio.

A joke so funny, you laugh to death. Just photocopy and drop it out of a plane.

A Shotgun that shoots surikins and lightning.

The "Whoop whoop" gun. It makes people start spinning around wildly, yelling "Whoopwhoopwhoopwhoopwhoop!"

A gun that fires rabid bears.

And a gun that makes people implode.

I would have to go with a either a) a gun that shoots out a liquidised flesh eating virus or b) a gun that shoots crystals that accelerate the aging process to a ridiculous degree (as in, one shot makes the target 125 years older).

Failing that, what about a gun that shoots chainsaws?

A laser chainsaw that shoots an infinite amount of smaller unstoppable and unbreakable rocket propelled laster chainsaws which create a massive explosion when they hit something.

Or a minigun shooting an infinite amount of bullets that are able to rip off someone's leg after going through 15 tanks and each bullet will punch a hole the size of a bowling ball in the wall of the average nuclear bomb shelter.

There Is No Kill Like Overkill

There is no overkill, ever. You may need to reload on ammunition, friends, infrastructure, enemies, political goodwill, the VIP you were supposed to protect, but a kill is not an overkill.

I want my enemies to suffer!

The GAG Gun - fires steaming balls of gas that stun people and makes incredibly itchy all over, suddenly they have to go to the bathroom for both needs and after 5 hours of this then they slowly turn in-side-out and catch fire. And then a baby is born from the burnt corpse!

Maybe like a gun with the fuctions of the gravity gun and the portal gun combined?

A gun that shoots high temperature steam in a huge radius around you, boiling all enemies alive.
And it's primary fire would be like a water gun, except with BOILING WATER!

My dream weapon has already been made...

http://www.youtube.com/watch?v=p4ebtj1jR7c

I want an AA-12 w/ frag-12 founds... lol LET THE FUN BEGIN!!

Aries_Split:
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.

Yeah, What I meant by the dragging part is like the gravity gun (upgraded) in Half-Life 2. Something like that...

LewsTherin:

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.

Read the books, script, played the game and watched the TV series and film.
"Ghastly"

Sword-Chuks and the Makeup Shotgun have already been done, but for sheer devastation.
The Californium Gun.

Califorinium (Cf : 98) has a critical mass of roughly 5kg. A .50 Sniper rifle should be enough to house two separates masses that get pushed into each other on impact.

Yep, a hand held mushroom cloud launcher. With a halflife of nearly 900 years.

ok...a cannon that does 0 damage but it shoot flaming gnomes and rick roll links...XD

Name:The Hookshot
Apperance: Gears of War Shotgun with a Huge Harpoon-like Attachment on it.
Function:Normal Shotgun Capabilities but the secondary fire is firing the harpoon hook. If it hits an enemy, u reel them in "MK Scorpion style". Time It just right and u can use ur shotgun part to one-kill ur "being-reeled-in" opponent. If u miss however, u have to rapidly press the secondary fire button to reel it back it manually thus losing time (I call it Active Cooldown).
Reload Style: In my game, there are two reloads. Active Reload (featured in Gears of War) where u time it right, and Active Cooldown in which for certain weapons u have to rapidly press the reload button to cooldown the weapon. The hookshot will have the Active Reload for the shotgun part, and Active Cooldown for the missed hookshots.

Spontaneous combustion gun

You fire it and no matter where he is tom cruise bursts into flames.

bad rider:
Spontaneous combustion gun

You fire it and no matter where he is tom cruise bursts into flames.

Non-fatally, I hope. I'd want to use it over and over.

Can i get a fuck yea?
Hint: it's a shoop

Presenting The Mother Nature Pack
Weapon 1:Geo Granades
Function: When thrown the grenade digs deep into the earth and when explodes, the earth is altered like being risen, sunk, risen to a hill, become a sinkhole.
Note: They're Different Types of Geo Grenades That Do These Different Functions.
Weapon 2:Elemental Cannon (E. Cannon)
Function: Absorbs and stores the element the player is standing on and converts it to energy ammo. (Four elements: Fire,Ice,Lighnting,and Air which is accumulated automatically) There are two types of fire, Spray or Burst. Spray fire has shorter range, but more of a chance to add a status effect.
Fire: Absorbed by standing near hot surfaces. Spray:Flamethrower/Burst:Fireball. Chance to continuosly burn opponent.
Ice:Absorbed by standing in cold surfaces or water. Spray:Mist/Burst:IceShard. Chance to freeze opponent.
Lightning:Absorbed by standing near machines Spray:Electric Circuit/Burst:Thunderball.Chance to stun opponent.
Air:Absorbed by walking. Spray:Vacuum(Pulls Nearby Object to cannon like the Gravity Gun)/Burst:Push(Releases the object pulled Like the gravity gun. If no object has been vacuumed, it just releases a burst of air that pushes enemies and objects). Always pushes back opponent. Can also be used to give u a boost by pointing straight down.
Weapon 3:Drill Arm Launcher
Fuction:Huge Drill that when the primary button is pressed digs into the ground, and fires a rocket underground. Press the primary fire button again to detonate rocket, releasing ahuge vertical blast against enemies on top ground. Press the melee button to start drilling nearby opponents, (Picture the Gears of War Chainsaw kill but with a giant drill that drills through the opponent).
Reload Style:Active Reload.

I would have a wood board, with not one, but TWO nails through it!

I think I didn't see these two weapons but the healing gun and the one that shoots needles that the medic uses in TF2. Oh yeah, I also want one of those Dalek weapons/tommy guns from the third season of the new doctor who.

http://img.photobucket.com/albums/v160/merc501/dalekgun.jpg
That's what it would look like.

wewontdie11:
I would have a wood board, with not one, but TWO nails through it!

You mad man!

I would have the most woot weapon evur. THE MAGUN!!!! LAWLZ! If you know what final fantasy unlimited is and know what the magun is can I get a hell ya!

bottle of whine- kills smacktards on contact
or
the BAN HAMMER- bans on contact
or
IP CLOAK- negates the BAN HAMMER
lol

Fourth Dimensional Ballpoint Pen

--Manifests as a normal ballpoint pen with a click top. Clicking the top arms the pen and then pointing and clicking again unleashes a fourth dimensional matter cannon that fires a cylinder of matter at just nigh the speed of light. The actual cannon is the size of a Hummer but almost all of it's substance has been shifted a quarter inch into the fourth dimension.

Anything caught in the stream is instantly obliterated.

Natural male enhancement.

a gun that shoots velociraptors

they have already made the best weapon ever:

the heavy Sandvich

Zero121090x:
Presenting The Mother Nature Pack
Weapon 1:Geo Granades
Function: When thrown the grenade ...

You'll be looking forward to Fracture then? http://www.lucasarts.com/games/fracture/

the lever: after targeting an opponent (or friend) the user pulls a lever, and a trapdoor opens beneath the target.if they are in midair at the time, a trapdoor swings open above them, smacking them down into the initial door.

Wewt:

Can i get a fuck yea?
Hint: it's a shoop

Are you kidding me?
That weapon doesn't have nearly enough flashlights.

And what's up with the Swiss Army Knife? No spork? C'mon, what are we, amateurs here?

A harpoon with beyonets and you can retract the harpoon with a chain.
If you hit a wall, you have a grapple. Hit an enemy, you can pull them into the beyonets.

Also, massive nunchuks, like each piece is 5 feet long.

How's this for flashlights?

dalek sec:
How's this for flashlights?

Hmm...

It'll have to do.

At least until I figure out a way to affix a 65-million-candlepower spotlight onto the front of an assault rifle.

Homing Brick:
An ordinary red brick, brick that homes in on targets, taking shortcuts through vents or water pipes to hit its target in the back of the head. Reusable, deals blunt trauma and often found in large numbers...

Dunno why I've just had the obsessive idea of a game where the player can use bricks as an improvised weapon, till a cop turns up and we can steal his pistol/baton/police car/helmet.

A top loading crossbow. It would be small enough to be held in one hand, and have a rack above the currently loaded bolt containing bolts to be loaded. The bowstring would spring back quickly after firing, so that the weapon can be used much like the pistol from Half Life 2, except more suited for medium range combat, than short.

The bolt rack above would hold 12 bolts, plus one ready and loaded for a "magazine size" of 13.

Perhaps for boss battles, a fire attachment could be added, so that bolts, covered in pitch, get fired through a flame at the front end, catching on fire as they get launched.

Also I'd be up myself enough to give it some metaphorical, avant garde name, like "Love", or "Hope".