I don't really mind people just walking by behind me, but for someone to stand behind me, especially right behind me where I can't see them, for any length of time will freak me out, especially if they're making noise.
If someone stands astride me as I'm laying on the floor, that will freak me out FAST, especially if I start asking, and then screaming, for them to get off me and they refuse to do so.
Does anyone else react this way?
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If my screen name doesn't make sense, read it out loud.
In a rational world, those who act in rational ways would be considered normal, and those who act in irrational ways that they somehow decided were "right" would be the freaks.