Joaquin Phoenix stars in "Joker" which has divided critics and movie goers alike. Surprisingly, it has divided mental health professionals as well. Some say Phoenix's performance shines a light on the misunderstandings of mental illness while others believe it promotes a falsehood that mental illness is responsible for violence. In this episode, David Puder, M.D. and Hans von Walter, M.D. discuss Joker's cinematic and mental health themes.