I watched Patient J this morning and think you should do the same. It’s a great little fan-film from 2005, based on the Batman-comics "The Killing Joke" and "A death in the family". It’s about when a psychologist sets up a secret interview with the one and only Joker, who I think is brilliantly portrayed in this piece. Watch!
And on a much lighter note; Here’s The Amazing Adventures of Little Batman, another fan-film. It's based on the 1966 Batman TV series, which doesn't have much to do with the Batman I know and love, but basically the movie is funny because Batman & Co. are all played by a bunch of kids.