Once I was playing MW2 round my friends house, now he has voice chat enabled and I don't on my xbox, so I was busy playing and listening to the other players rage and share bad tactics during a rather average Merc Team Deathmatch. Enemy team wins, and one of ours, with a realatively high-pitched voice, shouts "What! How the f**k did he get me! No waay he coulda seen me there!" Game winning kill cam shows up, an enemy sniper switches to an AA12 and blasts the unlucky guy's head off in slo-mo. Then, the angry kid calms down and says "Oohh, that's how he saw me, I had a big arrow saying "YOU" above my head..."
Needless to say I fell off the sofa.