The document summarizes different theories of media effects, beginning with the "bullet theory" or "hypodermic needle model." This theory suggests that media messages directly influence audiences in uniform ways. The document then discusses criticisms of the bullet theory from scholars like Lowery & De Fleur and Berger. It also discusses the Payne Fund Studies on the effects of movies on children's behavior. Finally, it provides brief examples of propaganda and the concept of "wag the dog."