Knock, Knock!

Ellie just told her first Knock Knock joke! =D

I've been saying, "Who's there?" when she says knock knock, (which she says every time she knocks on something) and just now we walked through the door and she grinned and said, "Knock knock!" and I said, "Knock, knock!" and then she chimed in with "Who's there?" and when I repeated it, she said, "The door!"

She gets it! Sort of.... (we still have to work on the punchlines!)