The Waterboy (1998)

Raised by his overprotective mother, Helen, Bobby Boucher Jr. is the water boy for a successful college football team coached by Red Beaulieu. When Beaulieu fires Bobby, he takes up the same position for a losing rival team, led by despairing Coach Klein. After witnessing Bobby beat up a player who teased him too much, Klein adds him to the roster as a linebacker. Soon, Klein's players are championship contenders.