MZ: Can I tell you a knock, knock joke?
MZ: Knock, knock!
Me: Who's there?
MZ: Time to go to bed!
Me: Time to go to bed who?
MZ: Time to go to bed for me! Let's go!
Me: You don't have to tell me twice!
I think he wanted to go take a nap because I told him he could watch Up after he has lunch and takes a nap. But I'm not complaining ;)