Why are Người dơi and The Joker such great opponents?

I think it is that they are polar opposites, but like a magnet drawn to eachother out of for the Joker amusement and Người dơi for duty..Batman on the opposite side reasons and believes in justice while the Joker never reasons and mocks goodness..He is maniacal and without what most deem as reason hoặc remorse so they work well as perfect opponents who without the other would have nothing to challenge themselves with...Heath đã đưa ý kiến it best when dangling..and I won't kill bạn because you're just too much fun! ....