Seen from the window of the Oxford Tube yesterday

We were at Hillingdon, and the coach had stopped to allow people off. Through the window, I saw a man standing beside a large, bright green motorbike. He wasn't wearing his helmet, but it was the same colour as the bike, and panels of his leather jacket matched, too. While I watched, a boy cycled past on a pushbike which was the exact same shade of green. They made eye contact briefly, and then the boy cycled on.