The joker

Boy Wonder is learning about jokes lately. Knock-knock jokes in particular. In fact, he spent Friday's drive home (about 35 minutes) telling me a wide selection of them!

However, "learning" is the operative word here. He knows about knock-knock jokes, and knows that people think they are funny, but he doesn't quite understand why the plays on words or sounds are funny. Therefore, his knock-knock jokes are not so much jokes as verbalizations of random adjectives and nouns, with a "Knock, knock?" thrown in for flair. He thinks they are all hilarious. I'll let you judge for yourself; please enjoy the selection below.

Knock, knock!
Who's there?
Potatohead!
Potatohead who?
POTATOHEAD HOUSE! HAHAHAHAHHAHAHAHAHH! THAT WAS A FUNNY ONE, MOMMY!

Knock, knock!
Who's there?
Fire engine!
Fire engine who?
FIRE ENGINE BICYCLE!

Knock, knock!
Who's there?
Tree!
Tree who?
Tree grass! No, tree grass marker! HAHAHAHAHAH!!!!!!! THESE ARE FUNNY JOKES, MOMMY!