You were an assassin and you had to kill the King during the Royal Ball. You dressed up as one of the royals and while everyone was dancing, you came up to the drinks table.

As you were about to pour poison into Kings drink, someone grabbed your wrist and dragged you into the dance floor. The person put his hands on your waist and started dancing. "Its not very nice of you to try and kill the king, you know..." You looked up to see, prince. Son of the king that you were trying to poison.