Sometimes the best horror is what your mind sees and not your eyes. The same goes for movie deaths, an off-screen death can be just as effective if not more than seeing it happen. Take this scene from Let The Right One In for example, little Oskar is a 12-year-old-boy who is constantly bullied at school. He befriends a mysterious child, Eli, who turns out to be a vampire. The moral of the story is...don't fuck with a vampire's best friend.