Ace Ventura both are awesome but When Nature calls is great...I dunno about the gorilla part or the "oh momma" it could be funny though, mind as well let them have a little dirty fun...
Dumb and Dumber is good too.
Los Tres Caballeros, plenty of funny shit and all kinds of exotic settings. Music is very catchy, prepare to be annoyed, lol.
Sword in the Stone, the art is sick!
I forgot the name of the movie with the flying bed but the best part is this futbol (soccer) game with all the animals, it's awesome!
Robin Hood
Fantasia
Willow...maybe too violent? I dunno...
Clash of the Titans the original of course, I dunno maybe too violent but the effects are so old it hardly looks real even for kids.
Legend
Dark Crystal
I dunno, I watch a lot of crazy shit when I was a kid. Excalibur when I was 6, Ben Hur even younger than that, so I'm not all too keen on keeping it all sweet ponies for kids, kids can take it.