EyeForFilmA young couple get lost in the rain and end up seeking refuge at a nearby mansion, where they encounter a bizarre scientist and his equally weird servants.
Based on the popular, but at-the-time hugely unsuccessful stage show of the same name, creator/genius Richard O'Brien has turned this into one of the greatest musicals of all-time, with a sing-a-long soundtrack so easy to quickly become addicted to. Absolutely and totally recommended. ~ The Lord

You have to be in the right mood for Rocky Horror and it helps if you have a house full of like-minded irresponsible cross-dressing adults to time-warp with. The mid section does, uh, drag, but the songs are evergreen and Frankie's elevator debut delicious. ~ The Sloth

Followed by Shock Treatment (1981), though many fans discard this as an official sequel.