 In Buster Keaton's "Sherlock Jr.", Keaton's protagonist actually enters into a film while it is playing in a cinema, as does the main character in the Arnold Schwarzenegger children's film "The Last Action Hero".A similar device is used in the seminal music video "Take on me" by A-ha, which features a young woman entering a cartoon universe.Conversely, Woody Allen's "Purple Rose of Cairo" is about a movie character exiting the movie to interact with the real world.