As I now take the train and tube to go to work a few times a week, I’ve been reminded about the amount of signage thrown at passengers everywhere. The sheer volume of it is crazy, and nothing really does stand out anymore. Or does it?
http://www.thepoke.co.uk/2012/03/05/guerillas-on-the-london-underground/

I know that the people that had this idea has to stay “secret” because they would at least prosecute him/her/them.
But it’s such a GENIUS thing and so well executed, they have my respect for life :)