I broke one kid's collarbone and knocked another kid into a goalpost and knocked him out in a game in Little League, both clean hits. They had a league meeting to see if they'd let me play after that but they decided to not take any action. I didn't maim anyone else the rest of the season.
I did fuck up a few kids in high school, but they pretty much had it coming to them.
I am one of four siblings, all of whom are excellent swimmers - my sister even being singled out for consideration for the national / olympic squad (but the training demands were too much for her and my parents). There was one year when all four of us were at the same school at the same time - and we smoked all-comers. My parents thoroughly enjoyed listening to the parents of the kids in other houses as I showed that the ongoing domination of the house swimming competitions wasn't ending any time soon. I was only 5, but I'd been swimming in a 50 metre pool since I was 4, so the 25 metre pool was no challenge for me even at that age. In my final year at that school, there was much rejoicing that I - the last of the clan - was moving on. In that last swim, I took 1st place in all 4 strokes and the IM.
No one ever (seriously) suggested that we be limited in some way in competition, although I think many secretly wished that my Dad had lost his balls while serving on the Gaza strip* in the '50s.
* He told my (young) mother that it was a night club.
