Mine would have to be the scene which starts of the level in Halo 3 "The Ark".
Nothing says "badass" more than having the Elite ships engage the Brute ships whilst the humans drop onto the Ark.
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[quote][b]Posted by:[/b] wcd45 Halo Wars - Three Spartans Vs. 12 Elites - best cinematic ever! [/quote] That was cool, but my favorite scene from that amazing game is... I have to say the climax where the Spirit slingshots off the planet and off to a random spot in SPASHE. Serena, shut up. :)