The main reason why people highly praise Flying over the Madhouse is that the film conveys a rebellious spirit of pursuing freedom, which is manifested in unwillingness to succumb to the system, courage to fight, courage to get rid of the shackles of thought, and help people around you wake up. As the soul of the film, Mike Murphy, played by actor Jack Nicholson, contributed to the plot and height of the whole film. He showed the cynical, witty and intelligent false mental patients incisively and vividly. This character will be smug because he fooled the system, and will be excited because he helped the real mental patients get out of the cage.