While it could be explained that the Joker is insane and simply doesn't believe himself to be real, there is a concerning ... a story in Joker's Asylum: Two-Face #1. In the past, he's also ...

“Joker: Folie à Deux” begins with a quiet ... Arthur becomes infatuated with Lee, but their relationship dances between real and imaginary throughout the film, and doesn’t make it clear ...