Knock knock

Our kids are at the age of loving those never-ending knock-knock jokes. Based on our dinner conversation, I'm not sure any new knock-knock jokes have been invented since I was that age. Elisa was so proud to have learned one of the classics that she told it to each of us in turn--well, sort of.
Elisa: Knock knock
Me: Who's there?
Elisa: Banana
Me: Banana who?
Elisa: Knock knock
Me: Who's there?
Elisa: Banana
Me: Banana who?
Elisa: Knock knock
Me: Who's there?
Elisa: Banana
Me: Banana who?
Elisa: Knock knock
Me: Who's there?
Elisa: Banana. . . . Orange. I'm glad I didn't say banana!

It appears she got her joke-telling ability from me.