The Rocky Horror Picture Show began as a musical stage play (1973, Richard O’Brien) and was adapted into a movie (1975). It's a rock music parody of science fiction and "B" grade horror films. The movie opened in the USA on September 26, 1975. When it was switched to a midnight run at the Waverly Theatre in Greenwich Village in New York City, as of April 1, 1976, it began to attract a cult following. Moviegoers themselves became part of the show: booing the villains, cheering the heroes, talking back to the characters, attending in costume and bringing props. The show+audience experience was never exactly the same two nights running, and some repeat fans attended hundreds and even thousands of times.