Along with Confucious jokes, "Knock-Knock" jokes are one of the most common juvenile humor forms in English. While common in Britain and the U.S., as the jokes are based on English word-play and puns, they are seldom heard outside native English environments. To some extent Knock-Knock jokes can be sources of information on the cultural references, brand names, etc., assumed to be "known" within a given culture. Compare the British jokes at the end with the American ones for likely 'transferability' to the other culture or variety of English.

American English Knock-Knock Jokes

Knock, knock!
Who's there?
B-4.
B-4 who?
B-4 I freeze to death, please open this door!

Knock, knock!
Who's there?
Wendy.
Wendy who?
Wendy today. Sunny tomorrow

Knock, knock!
Who's there?
Bisquick
Bisquick who?
Bisquick, your pants are on fire

Knock, Knock.
Who's there?
Chimney.
Chimney who?
Chimney cricket! Have you seen Pinocchio?

Knock, knock
Who's there?
Aesop!
Aesop who?
Aesop I saw a puddy cat!

Knock, knock
Who's there?
A Fred!
A Fred who?
Who's a Fred of the Big Bad Wolf ?

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British English Knock-Knock Jokes

Knock, knock
Who's there?
Macon
Macon who?
Have you got your Macon? It's raining out here

Knock, knock
Who's there?
Eureka
Eureka who?
Eureka something, and it really pongs

Knock, knock
Who's there?
Kenya
Kenya who?
Kenya think of anything that's more fun than geography?

Knock, knock
Who's there?
Nicosia
Nicosia who?
Clothing for sale. Buy your socks and Nicosia