This reminds me of an incident years ago. I was on a city bus, very full of people, and we were just about to leave a stop. There's a woman maybe 150 feet away running towards the bus. The driver sees her running and re-opens the door, waiting. Inconvenience to all of us on the bus, but hey, she's running.
The woman, seeing the bus has waited for her, stops running and starts slowly walking instead.
Driver sighs, closes the door, drives away.
I'm not sure what the moral lesson I take from it is, but mainly "if I go out of my way to help you, don't take advantage of my generosity". Maybe that partially applies to situations like this one. Or maybe just "don't annoy transit operators". That's a good one too.