Unlimited cracking?
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I can pop my neck unlimited and my shoulder
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I can pop my right thumb over and again, but sometimes after doing it like a dozen or so times in a short period of time, it will stop and I have to give it like a 5 minute rest. But it's pretty rare that I pop it that excessively nowadays. And I try to avoid popping it around other people too often since the noise can get annoying. My toes and ankles pop pretty often too, but that's more recent (probably from dance).