Nocenti's bat-shit lack of coherency seems to work well with the Joker. I mean, she writes everyone that way, it just only happens to work for the Joker.
Major points off for the last panel. NEVER show us the Joker's inner thoughts. We shouldn't even assume he has any. It's like in Seinfeld where everyone was given a scene of inner monologue but Kramer. It defeats the character.