Humor is really one of the hardest things to define, very...

Humor is really one of the hardest things to define, very hard. And it's very ambiguous. You have it or you don't. You can't attain it. There are terrible forms of professional humor, the humorists' humor. That can be awful. It depresses me because it is artificial. You can't always be humorous, but a professional humorist must. That is a sad phenomenon.