Movie guide to spotting demonic possession - Levitation 

Usually the first sign that a babbling, bed-ridden victim may be under the influence of some supernatural evil is when they start hovering four feet above the covers. This is even more disturbing in the case of Sigourney Weaver's Dana in Ghostbusters, who gets possessed by Gatekeeper Zuul and begins floating above her bed while trying to seduce Bill Murray's Peter Venkman. She was obviously trying to make it clear that there were no strings attached.

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