When Mike walked into my office for an academic advising appointment, I knew something was wrong. His normally pale face was a deep lobster red. His hair was mussed, and he was carrying a large, empty cardboard box. Instead of discussing his courses he rambled incoherently about a trio of ducks that were following him around the university campus. The purpose of the box, he said, was to help him catch the ducks, take them to the banks of a nearby river and release them so that they would stop bothering him. It gradually dawned on me that he was hallucinating.