In the heat of the moment, when your opponent is looking in your eyes for mercy, what do you yell to remove all hope of survival?

"I'm here to kickass and chew bubble gum, and I'm all out of bubble gum!"

Yes it needed to be said.

"No Retreat! No Surrender!"

For SPARTA!!

Nothing, I prefer to ambush my enemies in silence. If I need some sort of psycological warfare, I'll start firing Nebelwerfers.

"Bonk!"

Leeeeeeeeerrooooooyyy Jjjjeenkkiiins!

Of course, that might just remove my teammates hopes of survival.

"Double buttrape with a side-order of apple sauce, BITCH!"

Yeah i agree nothing more satisfying than a silent stab in the back...then back into the shadows lol

Or even ''when your dead im gonna teabag yo corpse''

I'm gonna have to go with "Hot Pie!"

-"Waaaaaagh!"
-Any gutteral shouts
-"For the dark gods!"
-"Blood for the blood god!" (can add "skulls for the skull throne!" here too)
-"Kill, Maim, Burn!"

-"For pony!" (LFG reference)

"How much is the fish!!!"

I don't listen to Scooter, I just happen to like that line and it confuses the bejesus out of anyone nearby, real life or online ;)

The Werebear:
Leeeeeeeeerrooooooyyy Jjjjeenkkiiins!

Of course, that might just remove my teammates hopes of survival.

seconded

"Why hello, want a sandwich? Your favourite, knuckles and mustard."

+Thwack+

-"For pony!" (LFG reference)

^

". . . MY GOD IM GOING TO DIE!!!"

or

"They give me nick names like, oh look its him and mommy im scared"

or

"DEATH BY PHILIPS"

1.I think I can, I think I can, I think I CAAAAAAAAANNNNNN!!!!
2.IF I DON"T GET ATLEAST ONE EPIC I'M GOING TO BE PISSED!
3.SOMEONE BUFF ME WITH FORTITUDE KTHNX!!!
4.I'M THE GOOD GUY SO IF I GET HURT I'LL JUST REGENERATE SO TRY IT!(gets riddled with bullets)
5.I WANT TO BE THE VERY BEST!
6.GET READY TO BATTLE REZ!

Or my favourite a medley of Hamster on a Piano and Gummy Bear to awesome/annoy my enemies to death

"Eat shit and die motherfucker" =]

(Said through gas mask)"Get that Freeman!"

(Said in Russian accent)"URA!"

(When Sniping and It's not technically a battle cry)"Goodbye, my friend. It was nice -Hey! Don't run away! *insert shot* That's what you get for trying to be nice to people..."

(When using Bayonet/Knife/Melee Weapon) (Russian Accent) "I think we should let some blood, yes?"

"Command, launch a nuke at my position!" as he's tied up and I have a personal teleporter.

"Shandrakor" If anyone gets this.......

ORCS ORCS ORCS ORCS ORCS ORCS

Yah, Trick Yah!

"CLEANSE! PURGE! KILL!"
For added effect, say that in a crowded area wearing a hazmat suit.

FOR NARNIA!!! acutuly could some one smack me

uhh im back now umm lets go with..... DIE DIE DIIIIIIIIIIEEE! (cod reference) just for u little kids who arnt alowed to own M games

WHERE'S MY WIFE!!!

I also had this battle cry with my friend while playing Ninja Gaiden. When all else failed we started screaming CLIVE BARKER!!! and it usually worked.

HIBBIDY HOOP LAH

I almost never seem to have some sort of clever remark when in the heat of anything. Most of my communication in a video game (or real life sport) is usually directly related to the situation at hand. If I'm playing with friends then there is usually a fair amount of small talk.

The best I ever managed when dispatching an opponent came in a fencing bout. Thanks to a clumsy attack, I stabbed my opponent near his mask bib from very close (and with a bent wrist) causing the blade to slide under the mask, above his jacket collar and into his kneck. He collapsed cursing and the only thing I could manage was "Aw hell, I think I killed him".

PitrDeVries:
"CLEANSE! PURGE! KILL!"
For added effect, say that in a crowded area wearing a hazmat suit.

Dechef:
ORCS ORCS ORCS ORCS ORCS ORCS

Orks:
-We'ze the Orks an' you iz not
-Orks is the biggest and the the strongest

My favourite is still from dark crusade when orcs see elder:
"Bah! Puny elder send half the boys home"

Chaos:
-"Despair, for I am the end of days"
-"It is as though a thousand mouths cry out in pain"
-"MAIM KILL BURN! MAIM KILL BURN!"
-"Sanity is for the weak!"

Guardsmen and spacemarine have some good ones too
-"Fear denies faith."
-"I Fear no evil...For I am Fear Incarnite!"

Sorry for the quote spam but I figure dawn of war battlecrys fit quite nciely here and these are my favourite.

FOR THE HORDE!

Plain and simple.

"You will burn like the heart of a thousand suns!"
"Rejoice... For bad things are about to happen" -Richard Lord of Darkness