Today films use morphing and other computerized special effects, but the effects used in "The Exorcist" were pretty darn good and scary -- spewing green vomit, bouncing beds, levitation, intense convulsions and moving furniture. The recipe for the green vomit was pea soup and oatmeal, a concoction dreamed up by special effects man Marcel Vercoutere. One of the more memorable scenes is when Regan MacNeil (Linda Blair) turns her head 180 degrees. She later goes one better and performs a 360-degree spin during the exorcism (a mannequin was used). Mercedes McCambridge, who supplied the scary voice of the demon, had to sue Warner Bros. for credit. Eileen Dietz served as a stunt double and actually performed the vomitting scenes for Blair. She also had to sue for credit.
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