My favourite:
A: Knock, knock! B: Who's there? A: The Interrupting Cow. B: The Interrupt-- A: MOOOOOOOO!!
A: Knock, knock! B: Who's there? A: The Interrupting Cow. B: The Interrupt-- A: MOOOOOOOO!!
Knock, knock
Who's there?
Interrupting coefficient of friction
Interrupting coeff -- MUUUUUUU