The Seven Year Itch is a 1955 film based on a three-act play by George Axelrod. The film was co-written and directed by Billy Wilder, and starred Marilyn Monroe and Tom Ewell, reprising his Broadway role. It contains one of the most iconic images of the 20th century -- Monroe standing on a subway grate as her dress is blown above her knees by a passing train.
Like thousands of other Manhattanites, Tom Ewell annually packs his wife (Evelyn Keyes) and children off to summer vacation, staying behind to work at the office. This particular summer, the lonely Ewell begins fantasizing about the many women he'd foresworn upon getting married (in one of the fantasies, Ewell and Marguerite Chapman parody the beach rendezvous in From Here to Eternity). He is jolted back to reality when he meets his new neighbor--luscious model Marilyn Monroe. Inviting Monroe to dinner, Ewell intends to sweep her off her feet and into the boudoir. Things don't quite work out that way, thanks to Ewell's clumsiness (and essential decency) and Monroe's naivete. Still, Ewell becomes convinced that his impure thoughts will somehow be transmitted to his vacationing wife and to the rest of the world, leaving him wide open for scandal and ruination. In the original play, the husband and the next-door neighbor did have an affair, but both play and film arrived at the same happy ending, with Ewell and his missus contentedly reunited at summer's end.