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

[stonethered]

Portal gun.

Why fight when you can run?

Why run when you can just make them fall on each other?
Kill two birds with a third bird.

My second choice would be Samus's varia suit.
That thing has enough minitaurized weaponry to destroy 20,000 knights.
Or to escape them, which is much more likely.
Edit: not first one to think of either, but that just proves how good an idea they are.

 

[Sephiwind]

Hmm.. and army entirly in full plate? How about stratgicly placed Super Electromagnets on armored cranes.

 

[jboking]

The Ray Sphere from infamous would be rather useful. Activate it and kill them all, then come out of it with badass powers.

 

[Fantasylord]

Use Ray Sphere from Infamous they all die and i get awesome superpowers, its win win.

 

[Eman645]

I definatly want the K.G.B. from tf2.

 

[[Gavo]]

A minigun. With a shitload of ammo. On top of a hill with a mountain at its back.

Or the MIRV in Fallout 3.

 

[GebGuy]

Quake's BFG

Quake 2's BFG

 

[CtrlAltD1337]

The Genocide Gun from Earth Defence Force 2017.

I kid you not, I saw this thread and that's exactly what came to mind. Personally though, either:
A) Redeemer from Unreal Tournament
B) Ion Cannon...also from Unreal Tournament (it's in 2004, not sure about 3)

 

[Fudj]

Terminator Armour.......dont even worry about giving me ammo.

 

[Ryuu Akamatsu]

Spoiler: Oh, nothing special

 

[stinkypitz]

A plain old sword.

I don't need your pussy mega-guns, if i have a chance to die battling an army of 15000 knights by myself sword in hand, Im going to take it damnit. There is no better way to die.

 

[Bob the Average]

a flame thrower connected to 1,000 gallon tank of fuel. that ought to put the fear of God into them.

 

[Scunner]

If it hasn't been said yet, the Mecha Hitler Battlesuit.

 

[Charli]

Frostmorne. After the mass destruction I have an army of 15k undead to boot. Pretty sweet deal.

 

[somekindarobot]

Simple: Necromantic powers. I could raise an unholy army of the undead and make them turn tale in pants shitting terror. Or, if we aren't fighting in a cemetery, I could simply resurrect myself over and over again until they get bored and go home.

 

[GoldenCondor]

I totally change my vote. I say 10 tesla coils from Red Alert.

 

[mad benji89]

i would just ride a brumak that should sort them out xD

 

[Orbot_Vectorman]

*A sudden red light in the middle of the field8
One Knight: What?
Voice over loud speaker: Nuclear Launch detected.
*Nuke goes off, all knights die"

or if I could chose the place of battle, I would chose a shallow pool of water, and I would wear a pair of rubber strechy pants+ boots, and shock the bastards.