London Tube Mischief - Send your photo's if you spot one

Now I'm not condoning this, but they are rather witty. Anyone who's done the commuter stint in London needs brightening up. I think they should make an official competition and run it for a month who ever picks up all the signs on their phone gets a prize of free travel for a month! Lets face it London's not the cheapest to travel around.
http://www.bbc.co.uk/news/uk-england-london-19858746