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:
First appearance a much lower 5.5 ("fine minus") sold for $956,000 in 2016. Shortly after the record-breaking million-dollar sale of "Action Comics" #1 in 2010, a copy of "Detective Comics" #27 featuring the first appearance of Batman was sold for $1,075,000 in a Heritage auction. Several factors determine the value of a first appearance. Note: All values are according to ComicsPriceGuide.com and are for editions certified by the Certified Collectibles Group (see below): While seemingly a simple concept, determining the first appearance may be complex. The following are instances in which a character's first appearance may be difficult to determine: Note: All