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

[Kevlar Eater]

I'd use a giant fan that would blow a very large cloud of powdered glass to the enemy, provided the natural wind conditions met my requirements. The army would end up breathing in the cloud at first with no problems, then they would rub their eyes and blink, but it only makes things worse. Plus, the powdered glass would wreak havoc on the windpipe and lungs, making those bleed.

But in reality, I'd use this [http://www.wired.com/dangerroom/2007/03/navy_researchin/].

 

[quiet_samurai]

An 30 foot high impenatrable wall that suddenly shoots out of the ground.

 

[Aitruis]

Portal Gun. Retreat to a cave or castle, and put one hole in the roof, and another in the floor in the only doorway to my room.

Plate mail is heavy. And at terminal velocity, fun times.

 

[Baby Eater]

An ice cream scooper and half a palatypus...they have no chance.

why only half?

OT: electricity plasmid zap one fry them all from the metal armor or ichigos zangetsu from bleach games.
i could jus use a lighter (aka flamethrower)to amaze them and convince them im god
EDIT: portal gun itd be so fun tricking their primative minds

The other half is back at HQ calling in air strikes, duh!

of course! silly me! hope you left the right half at hq

i got it! my most sadistic gmod invention!
LAND SHARK CANNON! O_O

 

[Neotericity]

An 30 foot high impenatrable wall that suddenly shoots out of the ground.

Not to poke holes, but what videogame is that from, clever as it is?

 

[Chicago Ted]

Gravity gun. Hey, they're in plate mail, I bet it would pick them up.

 

[Raziel_Likes_Souls]

A point-ed stick.

 

[Silent but Violent]

A lightsaber, combined with Kreia's telekinetic lightsaber form from KOTORII.

 

[rated pg]

The Redeemer. Or possibly the Spartan Laser.

Assuming I wasn't suicidal, I'd probably take a shotgun. I like to keep one handy for...close encounters.

 

[Supreme Unleaded]

A nuke, but detonated just far enough away that i dont get hurt and they melt into ash.

Edit: accually screw that idea, ill just ge into a C130 herculies and rain some artilary/minigun/grenade lancher on them, thay can't reach me when im in the air.

 

[Baby Eater]

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.

if abe was there everyone would explode from his awesome magicians skill

 

[Bat Vader]

Portal gun.

Why fight when you can run?

I have to agree. Running sounds best in these situations. Hiding also sounds good too.

 

[aakibar]

two words, Apache Gunship

 

[wizzerd229]

Experimental MIRV from Fallout 3 with 100000000000000 Mini Nukes

 

[delet]

God of War, anyone?

 

[Alpha Centauri]

A tank, What i dont kill will be scared, or run over.

 

[Macgyvercas]

Simple. BFG 9000.

Game, Set, Match.

 

[GoldenCondor]

A Nintendo DS and real life Scribblenauts. I'll find a way...

 

[Sgtkillalot0]

The virus Alex Mercer has, that I conveniently been training with ahead of time for max effect? Lots of blood, gore and violence ensues...

 

[SimuLord]

First off, plate mail != full plate armor. This is one of my pet peeves. If you mean "plated mail" [http://en.wikipedia.org/wiki/Plated_mail] (15th-century modified lamellar armor common in Slavic, Arabic, and steppe cultures), great, but if you mean the shiny, scary plate armor that High Medieval knights wore, then say "full plate armor".

And to answer your question, I'd probably pick some variation on the good ol' BFG with fully automatic firing. Most recent one I've used and enjoyed was the minigun in GTA Chinatown Wars on the DS.