Cows Say Moo

Listen up, buttercup. This here joke is playin' on the classic knock-knock format, see? But instead of givin' ya a name, the joke uses the sound a cow makes – "Moo" – to mess with the "Who" part of "Who's there?" It's supposed to be silly and unexpected, kinda like when you try to do your homework and realize you can't count past ten on your toes.