CoD4, I have made many kills by jump-knifing, set-nades and shooting through walls. I pretty much don't consider myself 'warmed-up' until some moron accuses me of hacking. Oh and I don't use deadsilence, gaymores, noobtubes, stuns, martyr, last stand, c4, rpgs, 3xfrag, jugg, double tap, overkill, uav jam, sonic boom, extreme conditioning, steady aim, or eavesdrop. I like my kills to be all me. =)
Also in Halo3, Valhalla, I smoked some poor sod with my banshee when he used the grav jump.
First time I played GoW, it was splitscreen, I got the Boom and Peek-Shot someone in the head with it from the boom spawn to the sniper spawn on gridlock. Their brains splashed all over their screen. It was a "holy-shit, ima buy an xbox now" experience.