No Caps - Berets Only

I have come across a lot of stupid signs in my life; most of them pretty harmless like "No shirt, no shoes, no service" or "Don't sleep on the grass", but sometimes a sign can feel very offensive. 

The (Australian based) Bank of New Zealand for example, tells people entering the bank's premises to take off their hat and yes, that includes berets!

The sign shown here, offered by a French stationary supplier, should be used in any public (and private) space really, as far as I'm concerned.