Broke my humerous (upper arm, JUST below the shoulder) in 7th grade. Couldn't get a cast, and had to wear this cute little immobilizer...
Few years ago I biffed a takeoff, and landed off-axis on my side, and my ski-pole grip went into my rib. Didn't go to a doctor about it, but I couldn't breath without pain for a few weeks, and was impeded physically for a few months before I was 100%.
this past spring I dislocated my shoulder. Still can't throw a football without pain. Likely some rotator cuff damage from it, and it popped out once on its own while swimming at the beach. Both times it popped out and went right back in on its own.