Oh crap!

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Why do most people scratch their head after some kind of dissappointment, like lost a game, or made a misktake? I got some responses from friends and some say there isn't actually an itch. Ok so I went ahead and tried this one while I was playing a video game. I screwed up at a very hard level and I actually felt an sudden great itch at the back on my head when that happened. What do you think guys? Have you ever wondered where the itch from your head came from after some goofy mishap or screw up that makes ya scratch your head?