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Originally posted by VekTorVik
Are you talking about goose-bumps, because I sometimes get those on the toilet? I didn't read all (any) of the links you mention, so can you describe this a little more? The second poster made it sound a bit like goose-bumps, but I was sure you were referring to something different.
I have been able to trigger some sort of weird tingling in my head since I was young. It does nothing special, but I sometimes wonder if I am not causing some tumor to grow every time I recreate this sensation. It feels as if I am squeezing something in my head. Probably flexing my crazy muscle.