What is your first reaction when someone says "I need to talk to you"?
I mean... it depends on the tone of voice but usually, "Oooh God, I'm in trouble!" unless it's a somber tone then it is more like "Oooh God, who died?" If it is a happy tone, it's usually just "Oooh God."
All in all... the only thing that stays normal about that I think when someone says, "I need to talk to you" is that I think "Ooh God." The rest is dependent on who it is and the tone.