Roller blading at 12 years old at an indoor rink. Trying to escape mom. Thought it'd be clever to zip around and hide in the skate rental area. Went in really hot, wheels caught on the threshold between the hardwood and the carpet, feet stopped, body went flying forward head first into the rental counter.
I knocked myself out but came to immediately and sat up thinking, "Holy cow, I knocked myself out!" Looked down and my right wrist was what they would later call a "100% displacement." Imagine looking at your right arm and sliding your wrist straight to the left to the point that it was basically parallel to your arm instead of in line with it.
Once I saw this I thought, "What the heck! I can't believe this doesn't hurt. Maybe I can 'pop' it back." wrapped my hand around the whole mess and tried to squeeze it back together. That was when I first felt the pain.
An ambulance ride and hours of inadequate anesthetic later - I kept waking up on the operating table and swearing at the surgeons while they were setting and re-breaking to try to align everything - I was put in a hard cast for two months.
They said there wasn't enough of the joint left to really fix it, but once it healed I was mostly OK. It has not really bothered me except for when I was bowling a lot and overdid it throwing a house ball.