film's clever gags and routines were lifted from Flywheel, Shyster, and Flywheel, giving Perrin and Sheekman an "additional dialogue" credit. Title Director McCarey reportedly came up with the title for the film, having previously used it for an earlier directorial effort with Laurel and Hardy. This continued the "animal" titles of the Brothers' previous three films, Animal Crackers, Monkey Business and Horse Feathers. "Duck soup" was American English slang at that time; it meant something easy to do. Conversely, "to duck something" meant to avoid it. When Groucho was asked for an explanation of the title, he quipped, "Take two turkeys, one goose, four cabbages, but no duck, and mix them together. After one taste, you'll duck soup for the rest of your life." McCarey also thought up "the very Laurel & Hardy-like sequence in which Harpo and Chico stage a break-in at Mrs Teasdale's house." Another McCarey contribution was the "mirror scene", a revival of an old Marx Brothers vaudeville act. Mirror scene In the "mirror scene", Pinky, dressed as Firefly, pretends to be Firefly's reflection in a missing mirror, matching his every move—including absurd ones that begin out of sight—to near perfection. In one particularly surreal moment, the two men swap positions, introducing the question of which is the reflection. Eventually, and to their misfortune, Chicolini, also disguised as Firefly, enters the frame and collides with both of them. Although its appearance in Duck Soup is the best known instance, the concept of the mirror scene did not originate in this film. Harold Lloyd used essentially the same routine in his short The Marathon (1919). Max Linder included it in Seven Years Bad Luck (1921), where a man's servants have accidentally broken a mirror and attempt to hide the fact by imitating his actions in the mirror's frame. Charlie Chaplin used a similar joke in The Floorwalker (1916), though it did not involve a mirror. This scene has been imitated many times; for instance, in the Bugs Bunny cartoon Hare Tonic, the Mickey Mouse cartoon Lonesome Ghosts, The Square Peg (1959), The Pink Panther (1963), the Tom and Jerry cartoon Cat and Dupli-cat (1967), Big Business (1988), X-Files episode "Dreamland" (1998), Garfield: A Tail of Two Kitties (2006) and the Family Guy episode "Road to Germany". Harpo himself did a reprise of this scene, dressed in his usual costume, with Lucille Ball also donning the fright wig and