So, a man is talking to his friend, who's a Psychiatrist. The man tells the shrink about a mutual friend, who's been having some serious health problems. After hearing about the symptoms, the Doc says, "It sounds like our friend may have a Psychosomatic illness. Tell him his sickness all in his head."
Several weeks later, the man is again talking with the shrink, and the Doc asks the man, "So, how is Mutual Friend doing these days?"
"I have some bad news. Our friend no longer thinks he's sick, now he thinks he's dead."