My girlfriend got a First bus yesterday where the driver accused her of trying to "scam him" and pay with a fake one pound coin. He asked her for another one, but then kept the supposedly fake one!
My girlfriend would never knowingly try to use a fake coin and is not dishonest. It is not the job of the bus driver to confiscate fake coins - I bet he will use it to pay for something..
I've had several recent experiences where bus drivers have been unhelpful (to a newcomer to Sheffield asking about bus routes) and bad tempered - doesn't paint a very good impression of the city...