7. Joker's Last Laugh (A LOT OF ISSUES)
The Joker is dying of a brain tumor, so he decides to have one last crime spree by unleashing total anarchy upon the entire DCU, Jokerizing villains left and right. It gets so bad that President Lex Luthor (that was a thing that happened) declares open war on the Joker. It gets serious. This over-the-top insanity is cinematic in scope. Countless villains and heroes duking it out on screen all thanks to a crazy nut job audiences love, with Batman at the center of it all, struggling to stop it. If DC plans on having a shared universe, this would be a nice way to incorporate other characters in a Batman film, like Superman. This is a huge story, so there would be some epic fight scenes. It might not be as intellectual or clever as other stories, but it's fun as all hell!