In the late 1970s a strange but relatively minor film musical called The Rocky Horror Picture Show developed a cult following whose like will probably never be duplicated — or even approached — by the fans of any other film. Redefining the term audience participation, fans of The Rocky Horror Picture Show turned showings of the film into multicultural and multimedia events. Audiences at a typical screening were likely (and expected) to dress as the film's characters, shout the movie's (or their own) lines' at the screen, sing and dance along with the musical numbers, and throw rice or fire water pistols into the air, en masse, at key points throughout the show. Why all the excitement? Why such slavish devotion to a low-budget movie about an interplanetary convention, a transvestite mad scientist, and a mysterious string of sci-fi seductions and...