Chasing Amy - Pretty much the whole first half an hour...Hooper X, the sex injury story exchange, and of course "your mother's a tracer!"
A League of Their Own - The whole Jon Lovitz sequence..."see, the way it works is, the train moves not the station"
Bridget Jones' Diary - The whole skirt e-mail part and their first "date" when Hugh Grant says "I bet you did you dirty b*tch"
Empire Records - The Robin Tunney/Renee Zelwegger insult scene where they rip up the MusicTown contacts..."no tattoos...no revealing clothing..."
Reindeer Games - "Nick doesn't do anything until Nick gets something for Nick..."
Side note: I can't believe none of the guys have mentioned Varsity Blues and the whip cream bikini!