Recently, I've an old horror movie based of Stephen King's novel of the same name, starring James Caan and Kathy Bates lead. And I've got to say that it's the most scariest s@#t I ever watched.
You really have to give all the credits to Kathy Bates as she won 3 awards for her acting.
If you think that's not scary enough, I suggest that you read the novel. It's way more brutal compared to the movie.