Yeah, I'm not much of a curser, but for some reason I turn into a sailor once the game starts...
I generally curse the DB we scored on, the LB who missed our RB for the tackle, the QB we sacked.. etc, etc.
For example:
Marion Barber escapes the Patriots onslaught and gets out of the endzone, preventing a safety:
"Yeah b**ches, how'd you like that? MB3 burned yalls a**es! Go cry like a b**ch now... yeah cry b**ch!! That's what I thought"
And the whole while I'm jumping up and down screaming, totally convinced the opposing players can hear me mocking them... and then my wife walks in the room and slaps me in the back of the head and tell me to shut up.
This little routine happens at least 30-40 times each game. My wife really hates football season.