15,000 knights are charging at you in full plate mail and all you're armed with is...

[Archemetis]

The Car From Brutal Legend.

 

[HentMas]

Yahtzee's microwave gun from the Darkest of Days video.

EDIT: Oh, from a video game. Well...nah, I still want the microwave gun.

you mean this one?? its a microwave emmiter from Fallout 3

Spoiler

 

[FolkLikePanda]

That electric spell from Fable II at Level 5

 

[Tal-]

arc lightning at level four from dota allstars

 

[the Magelord]

Hate to ruin the stream of creative answers, but, why not just shoot them? Armor isn't bullet proof or even bullet resistant. Hell, arrows went through the suits.
Maybe a nice fixed gun, like a mounted 50.cal or an M60, with a rather large barrel to finish them all off.

full plate, that is to say gothic plate, was arrow proof, and also largely immune to slashing weapons. the efficiency of bullets however, depends on the period. For example, a pistol shot from the 1600s was stopped more often than not by armour, (as seen on deadliest warrior) but a modern pistol will easily penetrate the plate. likewise, rifles from practically all ages will penetrate plate.

However, this is probably unhelpful and needlessly precise, so my weapon of choice would be the Ray sphere from infamous. steel plate conducts electricity just as well as any other metal. Failing that, Yahtzee's gun that shoots shriuken and lightning (or was it bees?)

 

[J-Alfred]

Portal gun. After galloping over the exact same 20 yards for the eleventy billionth time, they'll give up and go home.

 

[rythter]

. . . . . . hmmmmm RE4 INFINITE RPG THOSE SUCKERS!!!!!

you seem to like re4

 

[WhiteTiger225]

What weapon from a recent videogame would you use to defend yourself? (they're to close to use the fat-boy )
Good luck! I'll post my response after the first couple of responses.

1st I would like to point out plate mail does not exist.
Plate ARMOR exists though.

As for weapon, give me a Sten and a pile of clips and I assure you none of them would get close enough to swing at me. (Don't go claiming the sten would bounce off their 40lbs of steel body suit.. theres a reason armor fell out of use around the inventiuon of gunpowder XD)

 

[AfroNinja117]

The rocket Launcher from Halo 3: ODST. Not the normal one though... the one with 1000 rockets in it (anybody who's done Deja Vu knows what I'm talking about) if they're too close then I'll go GTA with one of their horses (If they have them if not then I'll just run) and head the opposite direction while firing back. you see knights charged basically in giant squares so two rockets takes out roughly 100 or more of them. Then when (if) I run out of ammo, I say fuck this and save and quit

 

[rythter]

The Scribblenauts notebook!

I will ride my Chinese dragon high in the sky as I watch my army of zombies led by Abraham Lincoln protect me from this foul threat.

i love you lol scribblenauts notebook ftw i mean... wow

 

[bassdrum]

MY FISTS!!
(they are made of steel)

or, more honestly, a plasma pistol and a BR.

 

[Rafe]

The Eden GF off FF8.

If anyone has seen it its hilarious, it tears out from another dimension, bends gravity and all the enemies into this cannon and the it fires them into a supernova!
Shame it only does around 2000 damage

 

[Volucer]

Spoiler: The force is all I need

Just imagine a load of knights being thrown everywhere by the star destroyer...

 

[Korten12]

the patriot gun from MGS4. booyeah...

 

[cocoadog]

a hug because that's all they really want.

 

[Cpu46]

a shovel, that way its easyer to bury the 15,000 solders after the epic battle.

 

[Timewave Zero]

I would personally use the Serious Bomb from Serious Sam. Annihilates everything, except you.
It's quick and awesome.
Or the Scream Attack from Condemned 2 (even though it was pure shit. The game, I mean). Make their heads explode!
BUT WAIT!!!
Maybe the Particle Cannon or Tesla Gun from Wolfenstein...

 

[Traskelion]

Meteor Storm! (other high-level Area-of-Effect spell will suffice)

 

[The Austin]

The Black Hole Gun from Rachet and Clank.


Yes.