I coached in quite a few all-star teams in Little League and Pony League tournaments.

In one tournament, 12-13 yr old Little League, we met up with a pitcher who was far faster than any we had ever seen. Our lead-off guy, a tough future pro, took the first pitch, listened to the sharp whack from the catcher's glove watched the cloud of dust emanating from it, stepped out, looked at me and laughed. It was so fast! We had two future pros, a number of future Div 1 players and got one hit.

The umpire was terrified and kept ducking out, which didn't help us any. We all thought his catcher should have been the MPV as there were no passed balls.

Later, in a Pony League tournament, we met up with a 230 lb kid with a full red beard and an astounding fast ball. We won that game handily because their catcher was scared to death and couldn't catch the ball. They had to pull their star pitcher and put in one they could catch and we could hit.

This kid, who went on in the Giant's organization for a while, was evidently the subject of attempted bans as he grew up. The problem is that in all youth sports organizations I know of, kids aren't allowed to jump to a higher age level. There were stories about Bo Jackson playing in the 12-13 level when he was 7 or 8, but that would have been illegal unless his league was a local rec league without national rules. Maybe an urban legend.

There are youth football leagues with weight limits, but I never heard of a speed limit. A kid kept dunking on my middle-school basketball team one game, but that was merely humiliating, not dangerous.