I’m sure that British people find American English absolutely hilarious. No doubt some of our most common phrases strike them as bizarre, or possibly obscene, but no British person would ever be so rude as to put up photos on their web page of signs that made them giggle.
Thank heavens I’m an American and have no such scruples. Herewith, my photo essay on Funny Signs of Britain. Warning: some of the signs are NSFWUYWIGB (“Not Safe For Work Unless You Work In Great Britain.”)