This man is a genius. He is also a teacher. My favourite posting of his that I have so far found on an education theme goes like this:

Where I work they have put up a load of posters promoting British education. "That which does not kill you makes you stronger," says one. This is supposed to be an advert for the University of Sheffield.

I got to him via her and her. They were both focussing on another not-to-be-missed posting entitled YOUR CHILD IS AN ILLITERATE CABBAGE. My thanks to both ladies.