A bloke is showing two young American girls around London and they come to a Pelican crossing. He presses the button and the pedestrian signal goes 'bleep-bleep-bleep-bleep....' 'Whats that for?' asked one of the girls. 'Oh thats just to let the blind know that the lights have changed' said the bloke. 'My Gaad' she said, really shocked, 'in the States we don't even let them drive...'