My favorite kill isn't even one I got. I was playing Halo 2 on Legendary, in the underwater ruins arena on Delta Halo, before you kill Regret. I was at the section with a large room, two Hunters, and about six Jackal Snipers. I kills three of the snipers, but by then I ran out of ammo and grenades. I closed in on a suicidal charge to melee the Hunters to death. I took out one, then moved in for the other one. A Jackal fired at me just as I moved behind the Hunter. The shot ricocheted off its armor, into the wall next to the perfectly straight line of snipers, ricocheted again, and the Jackal Sniper scored a triple kill head-shot betrayal, saving me and allowing me to win.