Humor, wit, and laughter surround each person. From everyday quips to the carefully contrived comedy of literature, newspapers, and television we experience humor in many forms, yet the impetus for our laughter is far from innocuous. Misfortune, stupidity, and moral or cultural defects, however faintly revealed in others and ourselves, seem to make us laugh. Although discomforting, such negative terms as superiority, aggression, hostility, ridicule, or degradation can be applied to instances of humor. According to scholars, Thomas Hobbes's "superiority theory"-that humor arises from...