Here.

This one's my favourite:

Fake London Underground signsS

(If you do not stand to the right, walk on the left on the escalators in the London Underground network, you WILL feel the wrath of everyone around you.)

and:

Fake London Underground signsS

I have to say that I've personally never found this to be true on the tube. People regularly come up to me and randomly start chatting, but I'm weird, so who knows.