During my first year as an umpire, I was working a Little League game as the BU. I was wearing an older pair of black tennis shoes that did not have a lot of tread on them. With an R1 and me in the LL C position, the runner tried to steal on a passed ball. I ran in to cover the play, hit a loose patch of dirt and my feet slid out from under me. I went airborne and landed hard on my side just as the runner slid into 2B. Fortunately I managed to keep my eye on the play and called the runner out on the tag....while lying on the ground.
No complaining, only a lot of laughter and one embarassed teenager hustling back to the A position.