Pazuzu (?????) is the ancient Mesopotamian king of wind demons. He's responsible for storms, drought, famine, and locusts. Though evil himself, Pazuzu is invoked on amulets to drive away other evil spirits, like the malicious goddess Lamashtu. He's also the spirit that supposedly possessed Regan in the film, The Exorcist. Image: World Imaging/PHGCOM on Wikimedia Commons