Cotard Syndrome is a rare and unusual mental affliction. It is a neuropsychiatric condition in which the person has a delusional belief that he is already dead and no longer exists. The sufferers of this condition think that they are zombies. They develop delusional belief that they are putrefying and can even smell the rotting flesh and that they have lost their internal organs and all the blood. Sometimes they also believe in the delusion of self immortality.
Jules Cotard, a French Neurologist first discovered this disorder and a patient suffering from it. He presented it in a lecture by false name Mademoiselle X in the year 1880.