I just made the mistake of watching the horror film 'Rec' on my own with the lights off. I live on my own and now I'm not going to sleep for a week!
Easily the scariest movie I've ever seen! The ending is amazing - if you're into horror movies and like being scared silly watch this film! If you live alone or don't like horrors avoid like the plague!
Now - I need to watch a disney movie or something to calm down!!