When director William Friedkin needed the voice of the demon Pazuzu to sound utterly inhuman in 1973's The Exorcist, he turned to Oscar-winner Mercedes McCambridge to dub most of the possessed Regan's dialogue. McCambridge pursued extreme, self-destructive techniques to create the performance: she deliberately chain-smoked, drank whiskey, and swallowed raw eggs to rasp and contort her voice, and Friedkin even had her tied to a chair during sessions so the vocal track would suggest a physical struggle. The recordings became one of the film's most unsettling elements. Behind the scenes a bitter credit dispute erupted: Friedkin later claimed McCambridge had at first asked to be uncredited so Linda Blair's on-screen performance wouldn't be overshadowed, but she subsequently complained at the film's premiere about not receiving recognition. The Screen Actors Guild intervened and McCambridge ultimately received formal credit for her vocal work, but the public back-and-forth — plus the extreme, health-damaging methods she used to create the voice — left a lasting, controversial footnote to one of horror cinema's landmark productions.
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