Knock Knock

A knock-knock joke told to me by my 3-year-old niece:

knock knock.
who’s there?
banana.
banana who?

knock knock.
who’s there?
banana.
banana who?

knock knock.
who’s there?
banana.
banana who?

knock knock.
who’s there?
banana.
banana who?

knock knock.
who’s there?
banana.
banana who?

knock knock.
who’s there?
banana.
banana who?

knock knock.
who’s there?
banana.
banana who?

knock knock
who’s there?
banana
banana who?
Shaggy ate the banana.
joke told by girl holding twig