Don't open it! A neighbor of mine didn't listen to his wife back when the SNES was the hot holiday item and she went through with the castration after she came home one day and caught him playing SMW. Poor Mr. Bobbit.
See, I thought she was just joking about the castration, but if you know people that actually followed through, then I guess I can hold off. That way I can keep my manhood and my DS.