Drag Me To Hell is one of those movies with endings that haunt you for the rest of your life. The main character gets dragged to hell by demons, as her boyfriend watches in horror.
I feel like that movie deserves a sequel: Drag Me to Hell 2 - The boyfriend is bent on finding out about the demon that took her girlfriend and getting sweet revenge. I know, making a sequel for a good movie is a bad idea, but some exceptions can be made.