If you've heard of Pazuzu at all, it's because you paid attention while watching The Exorcist. Pazuzu was the demon that possessed young Regan in the film. However, this fascinating character has a long history that goes back several centuries, far before he ever appeared in a movie. Regardless of whether or not you think that demons are actually real, belief in Pazuzu has definitely influenced the actions of countless people. In conflict with the film's representation, some historians have pointed out that Pazuzu is a bit of a conundrum as he doesn't easily fit into the modern day interpretation of a demon.