The Exorcist

The 70s wasn't the best decade for horror films, but it did spew out at least one that rates in the top ten of all time greats. The Exorcist was a sensation when it came out, and managed to live up to the hype. You can actually believe people fainted, tossed their cookies, and dropped over dead when they went to see it. Like Nosferatu, it has displayed the power to retain it's ability to produce shudders for generations not even born when it was released.

Awhile back they made like George Lucas and spruced it up with additional footage and effects. Sometimes that kind of shit sticks out like a sore thumb, but not here. It all fits in where it should and makes the movie even better. It's hard to imagine  that "spider walk" bit wasn't in it from the start.
The book ain't bad either, but, like The Godfather, the film has kind of turned it into a footnote.
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The Exorcist (The Version You've Never Seen)