Being an avid horror fan, there are a few films I'd suggest. For a spooky film, I don't think you can beat the Blair Witch Project (Quiet at the back! I know not everyone likes it!), then there's Superstition (The Witch) which is probably a bit dated by now, Any of the Omens, Evil Dead (the first one). Unfortunately, I haven't seen a really scary film for absolutely ages now, and most modern fare is the same old thing being regurgitated over and over, although I do have a soft spot for Scream 1 and 2, House on Haunted Hill and Thirteen Ghosts.