The best is from Major League, when Charlie Sheen thinks he is cut, and he says to his manager "Every time I pitch against you I'm going to stick it up... your F***ing ass!!" This gets magically changed to "I'm going to stick it to you!". Never mind that the original had about 4 syllables more... Then Charlie runs out into the locker room and starts a fight with Corbin Bernsen, and there's about 7-8 f-bombs that are redubbed hilariously.
Also, there's a part where Charlie beans one too many players and the umpire throws him out of the game. There's a lot of cursing between Charlie, the guy who got hit, teammates, etc. Charlie curses at the ump, and the ump says "get out of here rookie". Charlie goes "why don't you blow me ump?" This gets changed to "why don't you show me?".
AWESOME!!! I highly recommend finding Major League censored on cable, the censoring is almost as entertaining as the movie itself.