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Persons who suffer from Tourette syndrome find that one of the more disturbing symptoms of the disorder is the steady barrage of obscene phrases and words that pour from their mouths, seemingly beyond their control. For many years, the illness has been little understood, and recently, Dr. Oliver Sacks has made progress in his research. He is on hand to discuss the case of John, a teenager who has a particularly extreme case. In John's Not Mad: Tourette Syndrome, viewers can see that it is almost impossible for John to have a social life due to his troubling symptoms.