Based on a true story, apparently, which is exactly what you don't want to hear at bedtime.
Fun fact: The real Perron family visited the set and reportedly experienced paranormal activity during filming.
Genuinely wild that a film about a possessed twelve-year-old made grown adults faint in cinemas in 1973.
Fun fact: "Regan's bedroom set was built inside a freezer so the actors' breath would show on camera."