You know those moments where you just feel like a total and utter bada$$? Where you feel untouchable and would be perfectly content if the game ended right there? List them here.
For me:
-Mass Effect ending [Number one for me, nothing like watching Sovereign blow to smithereens, seeing your Shepard standing all bold, and watching the Normandy fly off with [url=http://www.youtube.com/watch?v=CRmOTY1lhYs]this in the background...[/url] what happened Bioware?]
-Halo CE ending [That feel when you realize you just soloed an entire Covenant army, a species of Xenomorphs, and saved the galaxy from certain death]
-MGS3's The End [I was shot by him twice. After finally beating him I was just like... "YES!!!"]
-Monsoon and Sam from MGR [Went SSJ12 or something on Blade Mode]
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Getting 30+ kills in a 50 kill game of team slayer on Reach always left me quite satisfied.