) the Nightcrawler scene for me, but a little nugget of gold was the Pyro scene at Bobby's folks' house. You could see how he started off scared, then angry and then evilly joyful.
Plus, I like fire
Next up would be the Magneto bridge scene, escape from prison and the Weapon XI fight.
Must say, besides how it got there, and the fact that it was Wolverine (of course), I thought the ending to X3 was pretty powerful in isolation. Unfortunately, that wasn't an option....