Simone: "Knock knock."
Me: "Who's there?"
Simone: "Look."
Me: "Look who?"
Simone: "Look out below!"
Me: "Ok. What's above?"
Simone: "A duck falling."
Me: "I see."
Simone: "It jumped from the ceiling."
Me: "That makes sense."
Simone: "The joke is just 'look out below,' though."