Turn up the ol’ “Oops..I did it again!” on the stereo there kids and join the party, as I’m sure that’s the song of the day over at Treyarch headquarters today. The second map pack for Call of Duty: World at War, released last Thursday, has racked up over one million in sales in its first four days on Xbox Live Marketplace and PlayStation Network, Activision has announced — a feat the game has managed twice in a row now. Back in March, the first map pack managed the same exact thing in the same amount of time, passing the 2 million mark a month later. And there really isn’t any reason to doubt Map Pack 2 won’t do the same.