For me, it’s the sound of dry napkins/paper towels or getting cotton under my fingernails. I know a lot of people struggle with scratching chalk boards.
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The skin crawling sensation is evolved to get you away from something thst could be dangerous to you, the more repulsed you feel by it thr more likely you are to avoid it.
I believe the nails on a chalkboard is theorized to be because the high pitched sound could be the scream of someone/thing I’m intense pain. Sometimes reflexes don’t work as intended though and random things can set them off.
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