I remember reading this but have no idea if there's any validity to it, but it said Christopher Walken's role in Batman Returns was originally supposed to be Dent in the story and the electricity thing at the end is what would've turned him into Two-Face.
That doesn't make much sense. Shreck was a corrupt businessman type. Why would Dent, as the D.A. conspire with a villain like the Penguin before he becomes Two-Face?