Knock Knock

Have you ever heard two four year olds tell each other knock knock jokes in the back of the car? It goes something like this, courtesy of Rachael and Clark...

Knock Knock
Who's there?
Egg
Egg who?
Aren't you glad I didn't get dropped on your head?

Knock Knock
Who's there?
Banana
Banana who?
Banana orange pickle.

Knock Knock
Who's there?
Apple
Apple who?
Apple juice!

And so on. One day one of them will tell a joke correctly, and it won't seem nearly as funny.