>Luke has two books of knock knock jokes, and he frequently regales us with jokes. I always imagined there would be a time in our lives where the kids were obsessed with jokes and I was sort of annoyed and rolled my eyes all the time. But I pretty much laugh every time I hear a knock joke. So this phase is going much better than anticipated.
Dave picked up the book and told one to Luke:
Dave: Knock knock
Luke: Who’s there?
Dave: Tyrone
Luke: Tyrone who?
Dave: Tyrone shoe laces!
Immediately Jack had to retell it.
Jack: Knock knock
Luke: Who’s there?
Jack: Tyrome
Luke: Tyrone who?
Jack: Tyrome shoehandsomes.
His version is even better, but this one is my fave:
Jack: Knock knock
Luke: Who’s there
Jack: Joke-uh
Luke: Joke-uh who?
Jack: Joke-uh Jack.
Jack (with a sigh): I love that one.
MetaMegan 
>THis one's for you Meg:Knock knockWho's there?SadieSadie whoSadie Pledge of Allegiance
>Knock Knock?Who's There?Anita.Anita Who?Anita drink.that's the only one I can remember and it was from a children's library book we had this summer.