'Knock knock!'

Let me hit you with this hilarious ditty my 2 year old threw at me in the shower this afternoon:  

Knock knock!
Who's there?
Knock knock!
Who's there?
Knock knock!
Who's there?.....

Hilarious. Though she hasn't quite mastered the knock knock joke, the rolling guttural laughter spilling out of her dimpled face when she 'tells' it is, all by itself, hilarious. I'm going to have to brush up on my knock knock jokes before we can take our show on the road. The one with Aw....don't cry, it's only a joke! as it's punchline is the only one I know. My tiny BFFs believe it to be the funniest joke on the planet. So naturally, I do too.