I remember running out of the room in terror at the end of Who Framed Roger Rabbit, when Steve Martin's eyes get all big and cartoony and, dare I say, evil.
I've seen screencaps of the movie since, and frankly I don't blame little me, it's still scary for a movie that's otherwise not frightening.
In honor of scary media month: what is the first piece of media you remember truly frightening you as a child?