All of these are pretty much NSFW so peruse at your own risk.
Happy Gilmore – Happy Gilmore vs Bob Barker
Caddyshack – Doodie!
Talladega Nights – Shut up, Chip!
Major League – Rick Vaughn’s Debut
Dodgeball – If you can dodge a wrench, you can dodge a ball!
The epic showdown between Roy Munson and Ernie McCraken
The Waterboy – Don’t Smoke Crack
Major League 2 – The Fight
Semi-Pro – The Poker Game
I know, I know. I left out YOUR favorite scene. Go ahead leave it in the comments so we can all relive said scene.