A small mental collection I have: Posters Caused By Things That Have Happened.
I first noticed it at one of those storage places, like Big Yellow Storage. There was a poster on the wall warning you of all the things you were not allowed to do in your storage unit. Sleep, run a business, keep goats, grow mushrooms. And I realised that the poster was really a record of all the things that people must once have done, which then needed to be banned.
The signs at the Grindleford Station Cafe are the same. Every incident causes a sign.
I mention it because Chris pointed out another on twitter:
