I think it's interesting how babies are born with a sense for the dramatic, but have no sense of humor. They come out of the womb wailing and crying. They tug at our heartstrings with big pouty lips and eyebrows raised in concern. Their eyes widen in surprise or fear. But it's not until we laugh that they start to learn what's funny.
Which is good, because I've convinced Caleb I'm quite hilarious.