Playing the wizard in 'The Wizard of Oz' is a pretty big deal, right? It's the title role. You'd have thought an actor would be happy with that and let some of the other, smaller roles go to other people. Wrong. Frank Morgan actually had four separate roles in the film other than the titular wizard.
You can also see Morgan as a guard of the palace, a doorkeeper, a professor in Kansas and a cab driver in Emerald City. In fairness to Morgan, an actor is never likely to turn down more money or more screen time, and he was never supposed to be playing the wizard in the first place. W.C. Fields was originally cast in the larger role, but he kept pushing the studio for more and more money, and they eventually lost patience with him. Fields was fired, and Morgan found himself promoted into the bigger part. We bet he couldn't believe his luck!