I found this awesome "what if?" Batman movie poster on the Bat-Blog. It was created by Sean Hartter, and features Christopher Walken as Batman, David Bowie as the Joker, and written by William s. Burroughs. From the looks of it, I would say this was to be a 70's era movie, and I can't imagine how insanely good it would have been! This is definitely my new desktop picture!