Why are people afraid of things that they know are harmless or non-existent? For example: Why do horror films/stories leave people scared after they have finished? Someone may see a harmless spider somewhere that isn't even on their property, and still be scared of it. What is the phenomenon behind this?
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closed as too broad by Why Do You Think That Is True, Community♦, Krysta, Josh Gitlin♦ Aug 30 '13 at 21:10
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