Do you crack your knuckles??

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Here's today's joke: Physicians tend to crack their knuckles more than any other people because they just have too much times on their hands. I crack my knuckles all the time!! In fact, i also turn my back so i could give my backbone (vertebra) a good cracking. Haha, sounds wrong, but i think you should be able to understand. As far as i know, my parents can't do that anymore, because they're ageing. I'm only 18 this year, so i do these cracking and it really feels so comfortable after the cracking!!