Imagine you’re sitting in a movie theater. As the film begins, actors’ names flash across the screen. The order of the names is determined by a combination of the actors' contributions to the film and the actors' celebrity status (or contributions to the field of movie-making). When a celebrity stars in a movie, he or she usually gets top billing. But what about when an unknown actor gets the lead role? Or when a celebrity plays a small role? In these situations, the actor may lose out on top billing but be given another place of honor: last billing.