Eh, this is an old kill, but it's still my favorite.
I was rushing in some TW map, Ruger on hand, running rabid. I ran passed some oblivious enemy player -looking the wrong way and shooting the wrong things- and I back flipped, getting a clear shot on his head and CRACK! popped him.
I'm still rising as his body falls, and I turn around to continue my rush, just in time to see an enormous sniper bullet coming directly at me. I return fire, shooting a single bullet to wherever the shot had come from, and kill him as I'm ripped in half myself. He was pissed, I think.