One of the scariest of all time
I saw this on DVD and never experienced it at the theaters.
When Friedken directed THE EXORCIST (from a gripping script by William peter Blatty), visual effects were not that easy to do. Nor were they readily available.
So it makes me appreciate the filmmaking even more... all of the visuals, including the green pea soup (at least that is what I have read about what the green vomit was made of).
Friedken and his talented group of actors (Ellen Burstyn, Max von Sydow, Lee J. Cobb, Jason Miller and, of course, Linda Blair) created a horrifyingly suspenseful movie, about the devil who takes possession of a young girl's body.