I know at least one person who thought it was scary because of how uncontrollable the situation is. If Jason is hunting you down you can run, don't go to sleep in case of Freddy, but unless somebody else steps in there's nothing you can do to prevent the possession. You can't avoid "getting" it, you can't yourself fight against it, and you can't escape it. Something enters your soul and takes control. That's what freaked them out.
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