Knock Knock

The boy I babysit has been crazy about knock knock jokes lately. I taught him the "boo who " one, which he thought was hilarious, so I reached into my brain to pull out something that would really knock his socks off. Here is the debut, unless it's been circulating for years and I haven't heard it (which is probably has).

Knock knock.
Whose there?
Hatch.
Hatch who?
Bless you! Do you need a tissue?

Boy did he laugh. He wanted to retaliate with one equally entertaining, so here is what he came up with.

Knock knock.
Whose there?
Bike.
Bike who?
I see my bike outside. (laugh,laugh,laugh,laugh...)

He kept telling jokes like that until I finally didn't give as enthusiastic of a courtesy laugh and I think he realized it didn't really make sense. We had a good time anyway.