If you could make any comic book movie, including Marvel and DC crossovers what would it be?

I would like to do a Spiderman/Batman crossover, or The Age of Apocaypse story. I think they would both make excellent movies. The Age of Apocalypse story/would have to be done by The Wachoski(Matrix brothers) though. The Spiderman/Batman movie would have to be done by Joss Whedon. Just a curiousity why do some of you feel every post needs a downvote?