"The Exorcist" Was Based on an Actual Maryland Exorcism. Here's What REALLY Happened

Did you know that "The Exorcist," one of the most famous horror movies of all time, was based on a real DC-area exorcism? The 1949 exorcism allegedly took place in PG, Maryland, and inspired "The Exorcist" author and producer William Peter Blatty while he was a student at Georgetown University. But some of the details in this famous case of demonic possession don't add up.