After flopping with its first cinematic run in 1975, The Rocky Horror Picture Show found life after death on the midnight-movie circuit. It appealed at first to a primarily gay crowd before ultimately becoming a sort of rite of passage for suburban teens and community-theater rejects. The film spoofs old sci-fi and horror films as it reveals the misadventures of Brad and Janet, a naive and happily engaged couple. Stranded in a rainstorm, the two find their way to a castle presided over by the sexually ambiguous Dr. Frank-N-Furter from the planet Transsexual in the galaxy Transylvania. The Doc is on the verge of creating a monster -- the ideal male in the form of the title character. The ensuing shenanigans include sex, murder, cannibalism (Meat Loaf is appropriately eaten), seduction, and more sex. Yes, this film is R-rated. The plot is nonsensical, but what actually happens on the screen is secondary: The real show takes place in the crowd.
While watching RHPS, talking out loud and throwing food is encouraged. The audience complements the film's dialogue with its own, made-up lines (including the ever-popular, "Ring around the lesbians!"), and uses props, such as rice (thrown during the wedding scene) and water pistols (squirted in the rain scene). First-timers ("virgins") may be a little put off at the ensuing chaos as well as the highly secretive induction rites for those who've never seen the movie. All this hullabaloo can be annoying if you're actually trying to follow the story, but like we said, plotwise, you're not missing much.