Zeppo Marx that "Herbie" was tagged with the name "Zippo" because he liked to do chinups and acrobatics, as the chimp did in its act. The youngest brother objected to this nickname, and it was altered to "Zeppo". In a TV Interview, Zeppo said that Zep is Italian-American slang for baby and as Zeppo was the youngest or baby Marx Brother he was called Zeppo. Zeppo replaced brother Gummo in the Marx Brothers stage act when the latter joined the army in 1918. Zeppo remained with the team and appeared in their successes in vaudeville, on Broadway and the first five Marx
Marx Brothers stage during the middle of a Groucho monologue to see if Groucho would be thrown off. However, to the audience's delight, Groucho merely reacted by commenting, "First time I ever saw a taxi hail a passenger". When Harpo chased the girl back in the other direction, Groucho calmly checked his watch and ad-libbed, "The 9:20's right on time. You can set your watch by the Lehigh Valley." The brothers' vaudeville act had made them stars on Broadway under Chico's management and with Groucho's creative direction—first with the musical revue "I'll Say She Is" (1924–1925) and then with two musical comedies: