The Poughkeepsie tapes.
It's not even a frightening, terrifying, scary, film it's just sorta creepy but I didn't sleep for 3 nights in a row, I slept only in the day time when I knew my family were in to keep me safe. I didn't even like being in my own bedroom anymore because I had a huge cupboard in there I thought anything... Anyone, could be in it. The film really got to me and seeing a specific screen shot from it, I always die inside.