Bus Full

Riddle: There is a bus full of people travelling over San Francisco and no one gets off the bus throughout the journey. But when it gets to the other side there is not a single person left. How is this possible?

Answer: They are all married.

Source: https://www.riddles.com/543

There is a bus full of people travelling over San Francisco and no one gets off the bus throughout the journey. But when it gets to the other side there is not a single person left. How is this possible? — Bus full by Anonymous v1.

Riddle: There is a bus full of people travelling over San Francisco and no one gets off the bus throughout the journey. But when it gets to the other side there is not a single person left. How is this possible? Answer: They are all married. — by Anonymous v2.