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Why does cracking your knuckles make that noise?

[Edit]
What's really happening when you "crack" your knuckles:

The noise you hear is actually the creating of small bubbles of nitrogen. This is an absolutely harmless thing to do despite all the "old wife's tales" to the contrary.

You pretty much just have a small air poket inbetween your bones, and when you move them again it pops

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First answer by SteveHend. Last edit by Mzhannah. Contributor trust: 0 [recommend contributor]. Question popularity: 57 [recommend question]

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