The lost art of the Knock Knock joke

Why do kids love knock knock jokes? Seriously. They don't understand them at all. They can't make one up to save their little lives. Not a decent one anyways.

"Knock Knock"
"Who's there?"
"Connor"
"Connor who?"
"I don't want to"

"Knock Knock"
"Who's there?"
"Mommy"
"Oh"

Finally we had something going...

"Knock Knock"
"Who's there?"
"Connor Bennett"
"Connor Bennett who?"
"Connor Bennett!"

"Knock Knock"
"Who's there?"
"Mommy"
"Mommy who?"
"Mommy Bennett" and hilarity ensued

Finally.... after a million tries...

"Knock Knock"
"Who's there?"
"Connor"
"Connor who?"
"Connor Bennett"

Yay!!! I'm so glad we worked for a half hour on that extremely funny Knock Knock joke.