Mine would have to be the opening clip in Devil May Cry 1
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I dunno. The one I liked the best was in Halo. in 343 gs... when you see the flood. freaky. also the intro to Age of Empires II; Age of Kings. Its cool like two kings are pklaying chess and when he moves the knight to attack a pawn it shows a bunch of cavelry killing inf. its really cool.