I have a friend who got this game in a team tournament on ICC:
Whats the fastest win you've ever gotten?

In casual OTB play, I've gotten the fastest mate possible, which is probably familiar to everyone, at least once:
Although, I could've technically been white and mating them a half move later...

2 moves here on chess.com to mate
1.5 to resign here (he hung his queen the first time he could move it.)
My shortest USCF mate was 10 full moves:
In a sicilian I took his f3 pawn with a smothered mate :)
So I won in four moves, whats the fastest win you have?