little old lady & little boy

Little old lay, riding a bus. Little boy, can you tell me how to get off at Pasadena Street?

Little boy. Just watch me, and get off two stops before I do.

-- A joke cited by Donald E. Knuth in his The Art of Computer Programming, Volume 1, Fascicle 1: MMIX -- A RISC computer for the New Millennium.

I learned about Knuth's annual lecture at the Stanford CS Department only in my final year on The Farm and therefore didn't get a chance to attend. It's said that the lectures always drew an overfull room of listeners.