One day while on set, Lee suggested that they have a dance off with the Volturi actors behind the directors and the other actors backs. The Cullen Clan vs. The Volturi.
However it needed planning and they had all practiced the choreography right under their noses.
Finally when the time had arrived, they had the audio crew set up the music to start at the right time and the camera crew to signal them once the two sides were in full frame.
Once the music starts, Peter Facinelli, who plays Carlisle starts by yelling “Perhaps we should settle this with a dance off!" They do their dance and the Volturi are at first shocked but then eventually everyone just starts freestyling.