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:
Zeppo Marx all four Marx Brothers equally — "When the "four" Marx brothers are on the screen, it's a riot" [emphasis added] — and went on to describe each of the brothers' unique style of comedy, and praised Zeppo as "the handsome but dogged straight man with the charisma of an enamel washstand." In her book "Hello, I Must be Going: Groucho & His Friends", Charlotte Chandler defended Zeppo as being "the Marx Brothers' interpreter in the worlds they invaded. He was neither totally a straight man nor totally a comedian, but combined elements of both, as did Margaret Dumont. Zeppo's importance