An artist asked the gallery owner if there had been any interest in
his paintings currently on display. "I've got good news and bad
news," the owner replied. "The good news is that a gentleman inquired
about your work and wondered if it would appreciate in value after
your death. When I told him it would, he bought all fifteen of your
paintings."
"That's wonderful!" the artist exclaimed, "What's the bad news?".
With concern, the gallery owner replied, "The guy was your doctor."