Filmmaker Kevin Smith was invited by DC to write Batman. This was the result. Chris Sims offers a lengthy take-down of why this was a very bad idea. Money quote:
Unfortunately, a creator -- any creator, in any creative field -- has to recognize his or her limits, and if he can't, that's what an editor's for. And you eventually come to a point where either the editor has to look at something and decide that it's an unpublishable mess or the creator has to take a step back and ask himself if he really wants his contribution to a 70-year legacy be a story where Batman gets high and pisses himself.