10. Tim Burton's Third Batman
Not that Burton's Dark Knight movies were the most gritty and realistic things around, but following them up with Joel Schumacher's camp-as-owt Batman Forever and absolutely awful Batman & Robin was a pretty big tonal shift. Sure, Batman Returns had penguins wielding machine guns, but it didn't have George Clooney wearing a shiny rubber outfit with prominent nipples showing through. The 1989 Batman and its sequel were pretty over the top, but they were very much in the vein of Burton's usual gothic sensibility, and Michael Keaton was an engagingly eccentric Bruce Wayne. It's all the more disappointing when you know that Keaton and Burton were both signed on for a third film originally, and audiences might've been saved from the sight of Val Kilmer's bulbous chin beneath the cowl.
And kung fu washing. The third Burton Batman would potentially have featured a return from Michelle Pfeiffer's Catwoman and the addition of Robin Williams in the part of The Joker, kick-starting his run of dramatic roles a good decade before the likes of One Hour Photo. There was also rumblings of Marlon Wayans screen-testing for the part of Robin, and Brad Dourif was in line for Scarecrow. Even compared to Schumacher's do-over, that sounds pretty rad.