Economics of psychological jokes?

Starting from the old joke about economists: "An economist is someone who knows the price of everything and the value of nothing."

A philosopher is someone who knows the name for everything and the meaning of nothing.

A comedian is someone who knows all the jokes and sees the humor in nothing.

A psychiatrist is someone who recognizes the insanity in everyone and thinks himself sane.

The philosopher joke is a few months old, but the other two are new today--and I'm suspecting I'll think of some more, even if no one adds any as comments. (Has anyone else ever looked at my blog?) The genre will never be as prolific as the lightbulb jokes, but it has some small potential.