Anyone ever seen Slaughter High? I watched it and enjoyed it, but it wasn't that creepy. Then I found out that the slasher in the flick, Marty, committed suicide after the film was released. I went back and watched it again after having gained this knowledge. It was like watching a completely different film. It was very eerie knowing that this kid killed himself and it changed the tone of the film. Creepy.
http://us.imdb.com/name/nm0780218/