The London Licensed Black Cab driver must acquire a detailed knowledge of the streets before he can get a licence http://news.bbc.co.uk/1/hi/sci/tech/677048.stm You are guaranteed a good conversation on any subject thanks to a cabby's enormous knowledge of everything which he gains from talking to his selection of world famous passengers. On entering a cab the conversation might open with "Ah, a camera! Keen photographer are we? Well I 'ad that blue geezer from Dubai in my cab the other day........" and so on. Keen followers of City Daily Photo can now rush to Dubai Daily Photo to feast their eyes on "that blue geezer".