1. A Lesson from Professor Marvel, a.k.a. The Wizard of Oz: How to Customize Your Presentation

In the opening scenes of The Wizard of Oz^[F1.1], Dorothy runs away from her Kansas home and promptly encounters Professor Marvel, a seedy, itinerant con artist whose tacky traveling wagon advertises him as “Acclaimed by The Crown Heads of Europe.” He offers his services to “Read Your Past, Present, and Future in His Crystal Ball.”

Professor Marvel, played marvelously by Frank Morgan, takes one look at the naive girl, glances down at her suitcase, and says, “You’re running away!”