usually it's something like this:
player1 eliminates his teammate player2
player2: Quit killing me!
player1 eliminates his teammate player2
player2 eliminates his teammate player3
player2: Sorry, meant to kill player1
player3 eliminates his teammate player2
etc.
Bain: Are there any major match/league scenes that don't use friendly fire? Granted, there aren't many other games with this style of gameplay (except other paintball games, which I think have friendly fire enabled), but many weapons in games have rapid fire 1 hit kills - counter-strike, for example, if you get headshots.