An inspector asked the girl in from of me for her oyster card.

Oysters, oysters, oysters says she
I've got the finest oysters that ever you did see.

Bet you didn't see that one coming...

When I lived and worked in Brussels it was always said that only tourists paid for their travel. None of the locals seemed to but I was always good lad. Apart from confusing them at the ticket office by saying "Can I have une carte des dix trajet, alsjeblieft"