Above is the original commercial teaser for Microsoft's upcoming Xbox 360, referenced by most as "Museum." It's short and worth watching.
Some have criticized it for capitalizing on the emotions we feel for veterans of real wars. Some have criticized it for ostensibly spoiling the game, since the fake veteran wouldn't be alive in the Halo universe had Master Chief (the character you play in the game) had not won. (But I mean, duh, of course you can win.)
But the real reason you need to watch the commercial, if you haven't already, is to gain context for this send-up from the folks at Consolevania. It's brilliantly done and so sadly accurate of the Xbox Live experience.