At my school,in the 70s, I used to be in fear of getting the cane. But it was good that there was a lesser punishment in slippering that didn’t involve detention.
Several teachers would give you a few quick whacks with a slipper in class for class misbehaviour and it was a good way of controlling a bunch of liveley adolescent lads. It wasn’t so much the pain, it was a brief sting, no worse, but having to bend over and let it happen to you in front of the class was the real punishment – a red face rather than a red bottom was the real deterrent. But it was by no means fun. And as both a recipient, and a witness to others getting it, it certainly put you on your best behaviour for a while.