Knock-knock KidsKnock, knock. Who’s there? Abby. Abby who?Abby birthday to you!Why it works: The visitor name is re-heard as part of a phrase, which completes the knock-knock wordplay.Copy jokeSave▲ 0Topics connected to this jokeBirthdayBirthday PunsCleanFunnyKidsKnock-KnockKnock-Knock Jokes for KidsPunPuns for Kids