Willy Wonka and the Chocolate Factory might be the most unintentionally creepy kids movie ever. There are several scenes that unnerve us in this tale of parents who are totally cool with a mad man showing their children around his death trap... er, "chocolate factory." But the one that always gets us is the boat scene, in which Wonka sings about impending doom as wild colours flash around him.
The entire sequence looks like something that was deemed too disturbing for a horror movie, and then somehow ended up in a kid-friendly feature instead.