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) four stowaways because he can hear them singing "Sweet Adeline".) If so, it would be one of only a few times Harpo used speech on screen, as opposed to other vocalizations such as whistling or sneezing. At least one other possible on-screen utterance occurs in the film "A Day at the Races" (1937), in which Groucho, Chico, and Harpo are heard singing "Down by the Old Mill Stream" in three-part harmony. This was the first Marx film to be written specifically for film, and the first shot in Hollywood. Their first two films were filmed at Paramount Pictures' Astoria Studios