This is without a doubt the richest Joker story that has ever been written. Alan Moore really knows how to embed philosophy deep within each of the characters he writes...the dialogue is very powerful and sometimes even distracts from Brian Bolland's beautiful art. The joke at the end, as well as the ambiguous ending, definitely provides for multiple angles of interpretation. Not very often that a writer is capable of invoking this much complexity (and fun) in a comic book.