Transformers:
Autobots vs. Decepticons (downtown L.A.)
Eastern Promises:
Viggo Mortensen vs. leather jacket thugs (bathhouse)
Harry Potter and the Order of the Phoenix:
Dumbledore vs. Voldemort (Ministry of Magic dual)
TMNT:
Leonardo vs. Raphael (I nerded out to this)
300:
Leonidas vs. Persians (slow motion slaughter)