As a spy go in the main hall and go towards the computer hack that has the lasers covering it. Climb up the nearby ladder to get to the top floor and there should be a box close by. Jump on the rail and if you look real close there is a steel pipe that is next to the rail. Jump on it and climb to the top and you have just activated the disco lights. Jump down and head to the main corridor that connects all 3 rooms and there are disco lights, confetti, and corny music playing.