Curse of the Demon.
This movie is like the Ring, and Signs. It seeks to creep you out instead of gross you out or make you jump with red herrings. The plot basically goes like this: Professor Harrington (Maurice Denham) is mysteriously murdered, seemingly as the result of a demonic manefestation. His collegue, psychologist John Holden (Dana Andrews) denies the evidence, until in the company of the professor's neice (Peggy Cummins) he finds himself the next victim( a nasty little trick where someone gives you a parchment and within a few days a demon will rise up from hell and kill you unless someone else
willingly takes the parchment and are killed by the demon instead). Dr. Holden slowly but surely comes to realize the great danger he's in and has little time to save himself or face a terrible death.
The movie plays with your head with sounds and atmosphere. It only blows it at the end when we actually see the demon and it's basically some guy in a rubber mask (this was made in the 50's long before the wonders of CGI) and it almost ruins the film but it's still good scary fun.