Knock, knock.
Who's there?
Boo.
Boo who?
Awww, don't cry!
Knock, knock.
Who's there?
Boo.
Boo who?
Awww, don't cry!
"Knock, knock." "Who's there?" "Boo." "Boo who?" "Don't cry in front of me, or else I'll cry!"
"Bippity Bobbity Boo, Boo Radley is coming for you!"
What did Stephen Hawking say when he died?
Boo Boo Doo.
Knock, knock.
Who's there?
Boo.
Boo who?
Don't cry, it's just a joke!