The Thin Man is a 1934 (and thus, pre-Hays Code) movie based on a Dashiell Hammett novel of the same name, and features William Powell and Myrna Loy as Nick and Nora Charles, a pair of hard-drinking, wisecracking, socializing types -- except that Nick is also famous for being a tough detective, and no matter how hard he tries, he can't quite stop people (most especially including Nora) expecting him to solve crimes. Almost every single modern crime-solving-duo owes something to this film -- everything from Castle to Warehouse 13, from Hart to Hart and Remington Steele to Moonlighting is, in part, a riff on a theme established in The Thin Man.