that sucks.
My thumb used to lock itself sometimes when i was a kid, i thought it ruled, but i did it so much to impress the other kids at school that it stopped
I pop My nukles alot espically if Im hIgh and nervious sux about ur tow sumtimes other parts of my body pop and like my ankel it gets Loud sumtimes to can hurt like a motherfucker but than it helps to be pop sumtimes