One Two Three Balls
Item Number: TA7536
This is a wonderful effect that can be used as an add on or natural progression after doing Stratosphere. It can also be a stand alone effect.
A cabinet is shown with three doors that can be shown empty. At that point a spectator is asked to freely select a ball. When the corresponding door is opened for that ball, everyone sees that a red arrow is pointing upwards at that ball showing that you knew which one they would pick.