When I think of "scary" in films, it's usually films that I saw when I was much younger. It's very rare that I would call a film scary today, but that's probably just age talking now. The "Vomit Creature" scene in Poltergeist II where it crawls on the floor and looks back smiling scared the shit out of me when I was a kid. The "Wheelchair" chase scene in The Changeling was also another one that gave the creeps. The invisible "Rape" scene in The Entity with Barbara Hershey (on the bed nude) was quite disturbing when I first saw it as a kid, and Stan Winston's effect seemed very real to me then.