now that may sound a bit harsh, please take it as the rather more light hearted thought it actually is. When the bus pulls up and the passengers start to get off, and get off and keep getting off and there are so many getting off you begin to wonder where they are all coming from. There appears to be more people getting off the bus than there should be room for on the bus in the first place. It is like watching that old circus clown visual joke with the little car which keeps disgorging clowns past any reasonable capacity of the cars occupancy. It would do the TARDIS proud.
And whilst on occasion those of us waiting to board might begrudge the time this mass exodus takes the potential for a seat, and maybe even one in a preferred location is sufficient consolation.