Re: Keyboard japes
I do remember pissing off a PE teacher so much* that he grabbed ~10yo me by my shirt and lifted me off the ground and shouted straight in my face.
It wasn't until a couple of years later that I remembered it (annoying a teacher didn't make much of an impression at the time) and realised that he'd have been fired if I'd ever mentioned it. Anyway, I learnt my lesson that it's best to stop being cheeky before you've wound someone up that much...
* Not intentionally, I just couldn't dribble a basketball round some cones, although I had probably deliberately been winding him up before.