I got a snack bum when I was about 6. I knew plenty of kids that got the slipper.
Worst thing I ever saw was the PE lesson at high school. We all had to put out our kits for inspection. One kid didn't have the right gear so the teacher grabbed his trainer and smacked him over the head with it. Lots of things that weren't supposed to be allowed, happened at the school.
A few days later the teacher came across the kids parent and ended up through a floor to ceiling pane of glass. After that he was less aggressive with us all.