Heard Any Good "Knock Knock" Jokes Lately?

Stone-cold serious question. Lately, Zoe's been all about the "knock knock" jokes. She's four now....and she's experiencing the zazz of a well-delivered punch line for the first time. I have no doubt that she's well on the way to becoming Winterville Elementary Pre-K's Ralph Malph when she starts in a couple of weeks. Like all good raconteurs, Zoe is down with the classics. Here are the hot "knock knock"-ers in her rotation right now:

- "Dwayne." "Dwayne who?" "Dwayne the bathtub...I'm dwowning!"

- "Boo." "Boo who?" "Don't cry. It's just a silly 'knock knock' joke."

- "Little old lady." "Little old lady who?" "I didn't know you could yodel."

- And the meta zinger: "Orange you glad I didn't say banana?"

So, back to the question...Anybody heard any good "knock knock" jokes lately? Give me some fresh material while Zoe still has time to work on it before Pre-K starts. Remember, she's only four years old...so don't be suggesting the blue stuff. That means you, "Dick Hertz." (Pic courtesy of The Rip Post)