Knock knock. Who's there? Who.

Who who? No, YOU'RE asking 'who.' I'm 'Who.'

Knock knock. Who's there? (Knock knock.)

(Knock knock) who? Oh, for goodness sake, you just started the joke again! This is an endless loop!

Knock knock. Who's there? Sue

Sue who? Sue-per excited to meet you, it's a shoe-in for a new friend!

Knock knock. Who's there? Peas.

Peas who? Peas-fully waiting for you to open the door!