"What if there really is a man with a hook for a hand, on the roof of the car?"
Do you mean this guy?
http://www.freerepublic.com/focus/f-news/1357490/posts
When they get to her house, the boy gets out of the car to open her door and screams ( this was in the days when boys still were mannerly...that's how old this story is ! LOL ) ; there attached to the roof of the car ( must have been a convertible ), was a blood dripping arm, with a hook for a hand, embedded in the roof.
BOOOOOOOOOOOOOOOOOOOOOOOOOO ! :-)