Playing little league baseball as a kid I slid down the once very common old wood benches to stay in batting rotation order. No fences in front back then.
A pointed piece of wood poked through my jeans, we didn't get baseball pants then, it missed my sphincter but broke off in my butt when I jumped up.
I gasped, told the coach. He looked and saw my jeans had a hole. We went over to my father, who took me to the car, pulled it out and I went back to play.
We get home my mother sees there's a piece of sliver/splinter in there. Out came the Bactine and her eyebrow tweezers, didn't have surgical ones then.
I never slid to move down a wooden bench again.