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Nothing! I would not want to have two myself, though. I personally would find it inconvenient, unnecessary, and (sometimes, like on me, in my context) could come off as kind of pretentious.
LOL! Never move to a Portuguese or Spanish speaking country then! ;D
Oh, I know there are places where it's normal to have long names, and that is fine. I'm just accustomed to dealing with only one surname per person, and I don't really see any justifying advantages, for myself, to having more than one.