Even though I loved it, The Brave Little Toaster gave me nightmares! These two scenes I always left the room until they were over:
The air conditioner blowing up. Here you go, kiddies, let's show you some suicide!
The clown dream.
Then the forest scene from Snow White, the Dumbo elephant dance, and the Pinocchio donkey scenes. Let's face it, Walt Disney was a little backwards in the head. Some parts of Fantasia were spooky as well. So let's hear your stories on films that freaked you out as a kid.