Ok I was trying out what seemed to be a simple trick...a peg manual...I couldn't pull it off and as the front tire touched back on the ground it turned causing me to fall. But as the tire turned to the right it caused my left shoulder to kinda sorta extend. I heard/felt this sound kinda like when you take a fist full of celery and twist. It kinda hurts now...what happened? And no I don't need no stinkin' doctors! Considering a physical therapist told me a few years ago that I didn't have very many workin ligaments and tendons...allowing me to partially dislocate my shoulders at will.