Crowded 61C Outbound, Oakland. Rush Hour.
A little boy, sitting with his dad, climbings on the seats, makes jokes, and laughs a lot:

Dad: Son, you better not look like you’re having too much fun. They charge you extra if you’re having fun.
Son: [wide-eyed] Really? No way!
Dad: Really. See all these people? Look how miserable they are.
Son: [Looks disappointed and sits still] …Oh…

— Overheard by Linda