There's an Internet rumor that professional weirdo Crispin Glover is being considered to play the Joker in a planned sequel to Batman Begins.
A source at Batman on Film says the talk might be coming from Glover's own publicist or from Warner Bros. as a trila balloon.
The site notes that some "mock-ups" of Lachy Hulme (Sparks from The Matrix Trilogy) as The Joker have already been done.