One horror movie fans heard that director William Friedkin had slipped various frames of a terrifying, pale-faced demon man into The Exorcist, they made it their job to track down those moments on VHS. They might have regretted doing so, given that Pazuzu - as he's known - is scary enough to haunt your dreams forever. There are a few instances of this guy popping up, and if you value your sanity, you'll stay away from the pause button.