Comedian

Calvin learned his first joke last week. He repeats it several times a day to whoever will respond. It goes like this:

Calvin: "Knock, knock"

Me: "Who's there?"

Calvin: "Hahaha!"

And really, even though the joke makes no sense, it's still hilarious just because he's laughing. (0r fake laughing, depending on how times in a row he just told the joke.)