Marx Brothers Say She Is". Their third feature-length film, "Monkey Business" (1931), was their first movie not based on a stage production. "Horse Feathers" (1932), in which the brothers satirized the American college system and Prohibition, was their most popular film yet, and won them the cover of "Time" magazine. It included a running gag from their stage work, in which Harpo produces a ludicrous array of props from inside his coat, including a wooden mallet, a fish, a coiled rope, a tie, a poster of a woman in her underwear, a cup of hot coffee, a sword; and, just after Groucho
Monkey Business (1931 film) in the Paramount promotional film "The House That Shadows Built" (1931). The concept of the Marx Brothers being stowaways on a ship would be repeated in an episode of their radio series "Flywheel, Shyster, and Flywheel" (1933) in the episode "The False Roderick" and would also be recycled in their MGM film "A Night at the Opera" (1935). The essence of Groucho's joke, "Sure, I'm a doctor—where's the horse?" would serve as an integral plot element for their film "A Day at the Races" (1937). Also repeated in that later film would be the uproarious medical examination that Harpo and