This is probably similar to the apocryphal story about Picasso: A woman who approached Picasso in a restaurant, asked him to scribble something on a napkin, an

This is probably similar to the apocryphal story about Picasso: A woman who approached Picasso in a restaurant, asked him to scribble something on a napkin, and said she would be happy to pay whatever he felt it was worth. Picasso complied and then said, “That will be $10,000.” “But you did that in thirty seconds,” the astonished woman replied. “No,” Picasso said. “It has taken me forty years to do that.”