When I was little the TV was on in the middle of the night. And so being little innocent me at the time, sat down a watched all of one of the Amityville horror movies (the one where the teenage boy shoot his while family, the demon talks to him through the head phones, later on in the movie after his family is dead he licks a priest) my mom was sleeping on the couch right be hide me and she wakes up to her 3 year-old shaking her and crying.
Moral of the story:that movie scared the sh*t out of me
EDIT: it was the second movie