A 1959 Horror film with a famous Gimmick. Directed by the man who did it the best, William Castle.Vincent Price plays Dr. Warren Chapin, who is researching the shivering or "Tingling" sensation fear causes within all humans. Dr. Warren is introduced to Ollie Higgins, the relative of a criminal sentenced to the electric chair, while making the autopsy of the corpse. Ollie asks for a lift to Dr. Warner, and introduces his deaf-mute wife, who manages a theater of their own.He gives her Acid and Ollie "Helps" unbeknownst to the Doctor.When Martha dies of fear, Dr. Warner makes her autopsy and finds a creature that lives inside every human being, a thing he had theorized on and jokingly referred to as "The Tingler", which appears to feed on fear and is kept in check by screams. The mute was unable to scream, and was frightened to death. The Tingler grew from a microscopic creature to the size of a human arm.Dr. Warren removes the beast to study it, but it escapes... INTO THIS VERY THEATER!Yes, that was the gimmick.Inside the theater were actors who were 'attacked' by the Tingler, and joy buzzers hidden under certain seats, as if the tingler were attacking you.