Has anyone ever considered that Batman and The Joker are different aspects of Bruce Wayne's persona? Mebbe Batman is Wayne's Superego, while The Joker is an incarnation of the Id. As Batman, morals and propriety hold sway. Conversely, The Joker represents the Shadow, the avaracious and unmoral appetite. In the middle, as Ego, stands Wayne, inert and steadfast....

Out of the armchair, now....