A: I don't believe the art world.
B: What is it this time?
A: An Andy Warhol drawing.
B: He's a famous artist.
A: He drew two butterflies and a flower on a napkin in a restaurant.
B: Did he sign it?
A: Yes.
B: Is it beautiful?
A: It's just black ink on a white napkin. And the napkin has food stains!
B: So it's not worth much?
A: Only about $30,000.
B: Without the food stains, it would probably be worth more.