McMurphy is the main character of the movie and he was transferred from the prison to the ward for observation. Because of his out of control behaviors. Therefore, the authorities of the prison suspected that he was faking insanity just to get rid of the prison. Then they asked help from the hospital to make sure about his illness. After his admission, he realizes quickly that the head nurse Mrs. Ratched uses these therapies to manipulate all the patients to do whatever she is asking for. As a result, he tries to contradict Mrs. Ratched’s orders whenever he can, he busts the patients to break hospital’s rules and enjoy the external life. He is a confident rebellious and his behavior is very difficult to change. Thus, the appropriate diagnosis is maniac episode and antisocial trait and he received the electroshock therapy.