2 Ways of cracking a joint
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 When i used to crack my fingers, one way would be to bend it back and then i couldn't crack for a while. However i can also like move my finger at the knuckle bit on the finger (not where the finger protrudes from) and like move it up and down and get it in a position where if i then push my fingertip on my thumb - it cracks? Anyone else do this? Post what you do if you want? 
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 never cracked my thumb.. 
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 Ok. 
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 lol 
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 I guess.