In 1979 a movie was released named Halloween. It was a very scary movie about, basically, a killer in a mask that murders baby-sitters.
I can say that horror movies scare the crap outta me, but mostly due to my cool personality, I don't get scared of anything like the dark after watching the movie. It's all in the mind.. (--,)
Back in the days of the Exorcist -- there was a movie "Beyond the door" a pocessed mom. Very scary, i tried to find it on dvd but found out its now banned!