|Famous knuckle cracker Charlie Sheen|
You are either a knuckle cracker or a yeller at the knuckle cracker. Personally, I am a knuckle cracker.
The first time I ever did and grossed out a teacher, I think I was hooked. And to be honest, it is pretty darn satisfying when you have that loud cracking sound.
For the record, when you "crack" your knuckles, you aren't really cracking anything, you are basically popping fluid bubbles around your joints.