At primary school, the usual classroom punishment was the ruler on our hands. At secondary school, we usually got the slipper on our bums in class but a couple of teachers used the slipper or ruler on our hands – which I found more embarrassing than bending over for it. I suppose that could have been because being rulered or slippered on my hand made me feel like I was back in primary school whereas bending over to be slippered was a “big girl’s punishment”.
It’s interesting how minor things like that can be quite significant. I doubt the ruler (or slipper) on my hand was anything like as painful as the “leather” though.