Because it's Batman, Wolverine & Alfred...plus Gollum and David Bowie!
But I went mostly for Batman and Wolverine...erm, I mean Bale and Jackman--AND IT WAS SO AMAZING!! My brain hasn't been this twisted since Fight Club!
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Lots and lots of SPOILERS!!! This movie needs to be watched without knowing anything about it, so don't click unless you've actually watched it! )