If you go into your xbox dashboard and change the language, the anouncer's voice in halo 2 multiplayer games will change too, and it is damn funny. Just remember after you switch the language to play a campaign level first, or it will fail to load the map in MP.
P.S. Get 25 kills in a row in Korean, its damn funny. And play a slayer in chinese.
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i've played a few in German but i'm totally gonna have to try all the others now.