A Difficult Case

Two psychiatrists were at a convention. As they conversed over a drink, one asked, "What was your most difficult case?"
The other replied, "I had a patient who lived in a pure fantasy world. He believed that an uncle in South America was going to die and leave him a fortune. All day long he waited for a letter to arrive from an attorney. He never went out, he never did anything, he merely sat around and waited for this fantasy letter from this fantasy uncle. I worked with this man eight years."
"What was the result?"
"It was an eight-year struggle. Every day for eight years, but I finally cured him. And then that stupid letter arrived!"