Knock knock.
Who is there?
Cows go.
Cows go who?
No, cows go moooooooooooo, not whooooooooooooooooooooo!
Alright, listen up, chucklehead. This "knock knock" thing is supposed to end with a name that sounds like the setup. But instead of following the rules, the joke says cows don't say "who," they say "moo." It's supposed to be unexpected, which is what makes it funny... to some people, I guess. You wouldn't get it. You probably still think milk comes from the grocery store.
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