knock knock joke

‘Knock, Knock.  Who’s There?’  What’s Your Best Knock Knock Joke?
‘Knock, Knock. Who’s There?’ What’s Your Best Knock Knock Joke?
‘Knock, Knock. Who’s There?’ What’s Your Best Knock Knock Joke?
This morning the hallways of the Mix studio were filled with a couple of kids laughing, Grant and Katie. Their laughter was contagious and quite cute and all off a sudden Katie busted out a knock knock joke. I'm guessing she was about 4 and said, "Knock Knock." One of the other jocks in the building replied to her with the traditional "Who's there?" And Katie replied with apple