Knock, knock. Who's there? Europe. Europe who? No, you are a poo!

Knock, knock. Who's there? Ya. Ya who? Oh, no thanks, I use Bing.

Knock, knock. Who's there? Nana. Nana who? Nana your business, that's who!

Knock, knock. Who's there? Cow says. Cow says who? No silly, cow says moooo-ve over!

Knock, knock. Who's there? Lettuce. Lettuce who? Lettuce in, I'm freezing out here!

Knock, knock. Who's there? Olive. Olive who? Olive the other reindeer, used to laugh and call him names!

Knock, knock. Who's there? Interrupting doctor. Interrupting doctor wh- You have a cold!

Knock, knock. Who's there? Boo. Boo who? Oh, don't cry – it's just a joke!

Knock, knock. Who's there? Honeydew. Honeydew who? Honeydew you know how funny these jokes are?

Knock, knock. Who's there? Isabel. Isabel who? Isabel broken? I had to knock!

Knock, knock. Who's there? Thistle. Thistle who? Thistle have to do until I come back!

Knock, knock. Who's there? Olive. Olive who? Olive you and I miss you so much!

Knock, knock. Who's there? Hatch. Hatch who? God bless you!

Knock, knock. Who's there? Henrietta. Henrietta who? Henrietta worm that was in my apple!

Knock, knock. Who's there? Bee. Bee who? Bee a dear and get that door for me, will you?

Knock, knock. - Who’s there? - Ham. - Ham who? - Ham-nesia, you won’t remember this joke!

Knock, knock. - Who’s there? - Buff. - Buff who? - No, buff me, I’m going in!

Knock, knock. - Who’s there? - Accordion. - Accordion who? - Accordion (according) to me, this is a great joke!

Knock, knock. - Who’s there? - Al. - Al who? - Al give you a kiss if you tell me a knock-knock joke!

Knock, knock. - Who’s there? - Anita. - Anita who? - Anita (I need a) little more time to come up with a response!

Knock, knock. - Who’s there? - Arthur. - Arthur who? - Arthur (Are there any) more knock-knock jokes?