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Bill Murray, Dan Aykroyd, Sigourney Weaver, Harold Ramis
chlorpromazine | Thorazine
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Psychologist Peter administers electric shocks to a subject every time he fails to correctly identify a Zener card (0:02) to study the "effect of negative reinforcement on ESP ability." (0:04)

Peter asks librarian Alice, "Have you or a member of your family ever been diagnosed schizophrenic or mentally incompetent?" (0:07)

Peter claims he has "PhD's in parapsychology and psychology." (0:41)

Police accompany possessed accountant Louis who wears a camisole. (1:00)

Peter tells his partners, referring to possessed musician Dana, "I just whacked her up with about 300 cc's of Thorazine."

Ghostbusters II

References in Ex Machina, Joe (2013)What Lies BeneathZombieland