At one point in A Night at the Opera, Otis B. Driftwood, the slippery business manager portrayed by Groucho Marx, arrives at an opera house. “Is the opera over yet?” he asks a door attendant. When informed a few minutes remain in the opera, he becomes indignant. “Hey, you,” he chastises the hansom cab driver, “I told you to slow that nag down. On account of you, I nearly heard the opera. Now, once around the park and drive slowly.”