when a 2-year-old & 4-year-old tell each other knock-knock jokes

...this is what it sounds like:

Katie: Knock knock.
Meg: Who's there?
Katie: Banana.
Meg: Banana who?
Katie: Banana Katie!
(followed by fits of laughter)

Meg: Knock knock.
Katie: Who's there?
Meg: Radish.
Katie: Radish who?
Meg: Radish...radish carrot head!!
(followed by hysterical laughing. Note: They don't even know what a radish is.)

K: Knock knock.
M: Who's there?
K: Orange.
M: Orange who?
K: Cheese!
(followed by big belly laughs. I think they think this is the funniest one ever.)