In Britain, where stage plays tend to be more popular as a form of entertainment than currently in the United States, many films began as a stage productions. Some British films and British/American collaborations that were based on successful British plays include "Gaslight" (1940), "Blithe Spirit" (1945), "Rope" (1948), "Look Back in Anger" (1959), "Oh, What a Lovely War!" (1969), "Sleuth" (1972), "The Rocky Horror Picture Show" (1975), "Shirley Valentine" (1989), "The Madness of King George" (1994), "The History Boys" (2006), " Quartet" (2012), and "The Lady in the Van" (2015).