Scientists have found that a bubble forms in your joint fluid when you crack your knuckles.
Here you can see the subject get his finger pulled in an MRI, shown in slow-motion video.
This is another view, where you can see the cavity forming.
It's still a bit unclear whether it's bad for your joints or not.
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What do you think of knuckle-cracking?
vote votesI do it all the time — it's so satisfying!
vote votesI do it sometimes
vote votesI've never purposely done it but I don't mind when others do it
vote votesI've never purposely done it and the sound of it makes my skin crawl