Finger twisting. If you spend a significant length of time with me and I have on a baggy shirt/skirt or there's a purse/some sort of fabric-y thing in the vicinity, I will be constantly twisting at it. Honestly, if there's anything even remotely twistable nearby, I will be twisting at it. I do it much more with my left hand than my right.
Less common, possible stims that I do: pacing, strange bodily contortions (ironically, I'm not flexible at all), making weird faces, talking to myself.
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"If there is anything the nonconformist hates worse than a conformist, it's another nonconformist who doesn't conform to the prevailing standards of nonconformity."