Sorry bro... Been there... Broke that. 2X left. 1X right.
Lemme guess... No shoulder protectors ? Head first ? Helmet rim onto clavicle ? Just the usual mechanism.
It only takes about 12 PSI to do it. Thus the proverbial 'karate chop'.
What ever you do DO NOT SNEEZE ! ...and good luck wiping your butt. Just sayin...