Knock, knock!
who's there?
Boo
Boo who?
Don't cry, it's only a joke!

Knock, knock!
who's there?
Earl
Earl who?
Earl be glad to tell you when you open the door.

Knock, knock!
who's there?
Emma
Emma who?
Emma bit cold out here, will you let me in?

Knock, knock!
who's there?
Howl
Howl who?
Howl you know unless you open the door?

Knock, knock!
who's there?
Cargo
Cargo who?
Cargo beep beep!

Knock, knock!
who's there?
Aardvark
Aardvark who?
Aardvark a million miles, for one of your smiles...

Knock, knock!
who's there?
Cows
Cows who?
No they don't, they moo!

Knock, knock!
who's there?
Albert
Albert who?
Albert you don't know who it is!

Knock, knock!
who's there?
Twit2
Twit2 who?
You sound like an owl!

Knock, knock!
who's there?
Duey
Duey who?
Duey have to keep telling me Knock, knock jokes???