It's been said before that the Joker needs Batman in order to exist. They are polar opposites essentially. This got me thinking. If it came down to the very end with no interferences or distractions, would either finish the other off? We all know Batman wouldn't. But would the Joker kill off Batman if somehow his crazed scheme worked out? Better yet, would he unmask the Batman before killing him off, or would he just kill off Batman without ever knowing who's under the mask?
On a side note, how would the Joker react if he accidentally found out Batman's secret identity?