This didn’t happen to me but to someone that I know well. One of the band members had brought a groupie back to the bus, and after they had finished, she used the loo not knowing about the rules. Driver told her there was a $200 fine as he had to empty the tank. Since all she had were the (very skimpy) clothes she was wearing, she suggested they come to some other arrangement, and vanished with the driver into the lounge at the back.
After a while they came out rather dishevelled and she got off the bus. Everyone was back on the bus by this point and it was time to go. Just then, the driver’s cell phone went off, and when he answered it, he suddenly went very pale and started mumbling apologetically. It seems when he had dropped his trousers he’d accidentally hit the “dial” button, and it had re-dialed the last number called, which just happened to be his mother. Poor Mum had heard the whole thing.
-Phildo