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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Probably this, or any of the cutscenes that follow. [quote][b]Posted by:[/b] ajw34307 Halo 2: - Convergence of the plot leading to John and Thel's meeting with Gravemind.[/quote]