Those kids of mine are hystertical. Here's Ben's knock knock joke of the day.
Knock Knock
Who's there?
Owls!
Owls who?
That's right, Owls Who!
Adam on the other hand is still trying to get away with the Knock Knock, Who's There? Chicken!, Chicken Who? Chicken I love you! Then he cracks himself up for like 10 minutes and tells it again. And again.
You just can't find entertainment of this quality on any old web directory. LOL.