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Jules Romain's satirical theatre piece Dr. Knock was brought to the screen by director Guy Lefranc in 1950. Louis Jouvet plays the title character, a medical charlatan who banks upon the hypochondria of others. He convinces every resident in a small French village that they're suffering from some malady or other, and soon he's doing a land-office business. Dramatic irony is achieved when Dr. Knock ultimately becomes a victim of his own success. Though Dr. Knock would probably work better on stage than on film, the end result is for the most part quite satisfying.