I broke my collar bone. I didn't even know it happened until hours later when I went to the doctor, and got an x-ray.
It was freshman year of high school, and we were playing capture the flag in PE. I tagged some guy, but tripped over his feet and went flying. I hit the ground, got up, and yelled "I TAGGED HIM!"
The bitch didn't stop, though. It was so unfair. But I sat down after, and I went into shock for a minute (loud ringing in my ear, vision loss). I got up and walked it off, and then went home and told my mother what happened. So she took me to the doctor right away.