Knock Knock Jokes

Our kids are currently at that age where they love to tell jokes. Especially knock knock jokes. They even more especially love it when we are all in the car, because we are all strapped in and we have to listen. Here was a typical exchange today. (Sorry if it's a little long, but it was a long drive to the doctor's office).

Maggie (M) told a joke, then started to explain it to Andrew (A), and he interrupted her.

A: Knock knock
M: Who's there?
A: Orange
M: Orange who?
A:Knock knock
M:Who's there?
A: Oran--
Mommy: Andrew, you're supposed to say banana.
A: Oh. Knock knock
M: Who's there?
A: Banana
M: Banana who?
A: Knock knock
(Repeat 3 or 4 times--you know the joke)
A: Knock knock
M: Who's there?
Mommy (dreading hearing 20 more minutes of this): Andrew say orange this time.
A: Orange
M: Orange who?
A: Glad I didn't. . . .
Mommy prompts: (orange you glad I didn't say banana?)
A: Orange didn't. . . .Orange glad I didn't say banana?
(hysterical laughter)

This time even I laughed a little. Not at the dumb joke that I have heard ad nauseum, but at how much that little boy can laugh at something that he obviously doesn't understand. He just knows that it is funny. Don't you miss when you're biggest concern in life was coming up with a good knock knock joke?