If you asked me how it began, I could truthfully say that the first time, it was an accident. It was about six in the evening, the time when the city churns again on its axis, and though the streets above were full of the sharp wind of another piss-miserable May, the station was stuffy and humid, squalid with discarded tabloids and fast-food wrappings, irritable tourists in garish leisurewear crammed amidst the resigned, sallow-faced commuters. I was waiting on the platform for the Piccadilly line Tube at Green Park after another fabulous