Scary movies.........?

I've heard paranormal activity was scary. Open Water, The Blob, the four Final Destinations, Dawn of the Dead, Eraserhead, Nightmare on Elm Street, The Fly, The Mist, War of the Worlds, The Saw movies, The Silence of the Lambs, THe Changeling, Pans Labyrinth, The Ring, Rec were all on the top 50 horror movies list. If you want to make a movie really scary, watch it at night, and turn all the lights off. If you watch horror films in the day, it takes away from the scary factor.