i was hit so hard once that my jaw poped, it was compleatly out on the left side and hanging BUT I NEVER WENT DOWN, it looked so bad that alot of people turned away and the other guy frozze in shock that i was still up and aware of were i was, the pain i felt when i tryed to close my mouth was something else because the pressure on the right side, i thought it might pop to. went to the hospital had some stiches for a cut and had the jaw seen to, had to eat soapy stuff so as to not put to much pressure on the joint for a whille