Some myth buster said that the sound from a knuckle cracking is caused by the bursting of gas(air) in the joint.
This is just bullshit.
This link: claims a process called cavition creates the gas because the "pressure in the pocket it reduced". As if a popping bubble woudn't cause some new pressure. And with all those popping bubbles in my knee why doesn't my skin swelll up like a bubble?
http://www.howstuffworks.com/question437.htm
If this is true then why don't my car break POP whe I release the pressure on my breaks. There's fluid there and the pressure changes.
I'm laughing my ass off.
Don't release you breaks too fast or you'll fucking blow up!!!
What a crock of shit.