The Colonel's birthday party is the perfect opportunity to retrieve the real painting of the Fallen Madonna with the Big Boobies from Herr Flick, and substitute it with the forgery. The plan is to not invite Herr Flick but make sure that he hears about the big binge – a traditional feast with genuine Bavarian dances featuring girls dressed as the Hitler Youth – so that he will have to come. In the meantime, René and Edith are to enter the office of Herr Flick to make the switch. Of course, they fail – which means Herr Flick now has both the fake and the original plus a second forgery, which he commissioned in order to fund his marriage with Helga after the war. (thetvdb.com)