ghosts

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i have been thinkg about this for quite some time already but i really cant find some logical answers. WHY ARE WE AFRAID OF GHOSTS? its true that they look scary, but i know that having scary looks is not enough to scare the hell out of everybody. what is it really with ghosts that we're really scared about? fear of the unknown? are we just not used to see them most of the time? or are there any real reasons why we have to fear them?