Everyone had one of these.
The teacher (usually the headmaster/mistress - or 'principal' for all you American viewers) that all the kids were shit-scared of.
When you did something so unspeakably bad, and got sent to see him/her, your palms started to sweat, your mind races to come up with excuses and reasons, and more often than not, a little bit of poo would come out of your anus.
Despite the fact that they were so old their flesh were literally decomposing at a daily rate, they still managed to strike so much fear into you. But now they're probably dead, so who're the real winners, eh? Us, thats who!