Video: One of the most terrifying horror films of the 20th century wasn't about killer ghosts or murderous psychopaths: It was about demonic possession. Now, almost 50 years after The Exorcist terrified audiences across the world, the real deal has invited us to see a bonafide exorcism. The first trailer has been released for The Devil and Father Amorth, a documentary from The Exorcist director William Friedkin.