My kids love A Knight's Tale, starring Heath Ledger when he was an unknown. It's about a commoner who masquarades as a knight. Ok, so there's a brief view of a man's bare bottom, but it's not sexual in any way (the character lost his clothes in a bet). Even if that's too much for school viewing, I recommend it for home for that age group.
Princess Bride, Wierd Science, Ghostbusters, The Dark Crystal, Karate Kid (1,2,3), Sandlot, Teenage Mutant Ninja Turtles the Movies (1,2,3), Who Framed Roger Rabbit, Mac & Me, Man of the House, Mighty Ducks and Matilda. My older kids are 23 and 18 and still watch it every now and again.