I know I suffer from PSTS, that is, Primary School Teacher Syndrome. One of its main symptoms is an adverse reaction to misplaced apostrophes and wrong spellings. This is the reason why I can not sit at the far end of the swimming pool near this sign.
If I lie on my sun lounger within reading distance I begin to get agitated. I begin to twitch slightly and I get an overwhelming urge to jump up and circle it with a red marker!
But my most severe reaction is that one night I couldn't help but deliberatly flout the law, just because of THAT spelling.