They aren't for a game, but the PS3 "Universe of Entertainment" commercials are some of the best commercials I have ever seen.
http://blog.us.playstation.com/2007/10/31/new-ps3-tv-ad-campaign/
http://blog.us.playstation.com/2007/11/16/sneak-preview-of-new-ps3-ads/
(I can't embed them because the PSblog used a custom video player at this point)
I still remember seeing those for the first time and thinking "ok, NOW the PS3 will go somewhere."
Not trying to be a fanboy. Of course, it's hard when you own the best console eve... dang it