I have not had anything major, but I have had a few.
1. Broke my middle finger playing basketball
2. Got a bad concussion in basketball (couldn't stand for more than like 15 minutes for about 48 hours.)
3. Broke my nose doing a backflip off of a diving board. (That one hurt like nothing else in the world)
4. Got kicked in the eye and scratched my retina.
The most severe injury though was not one that happened to me, but one that I caused. It was actually in the same game that I got the concussion. (rough game) I had a turn-around jumper at the free-throw line and when I pump faked, the guy jumped and while he was going down, I was going up and my elbow and his eye met. I shattered his eyesocket and he bled pretty bad.
So nothing as serious as an MCL or ACL, but those are mine.