I remember that during a History lesson at my prep school the teacher, who also happened to be the Headmaster, put a boy who was horsing around over his knee and spanked him a few times on his grey shorted backside. Not very hard and almost in jest I seem to remember but I think he was quite shocked at being upended in front of the class, we thought it was hilarious of course. Visits to his study for the real thing were far less amusing.
Though not in School, I have often been hand spanked by my mom when I was very young, and at times on bare buttocks. Though it was very painful, the touch of her hand on my bottom skin,I derived pleasure as I grew older.I remember those spankings with nostalgia.