Begin this trick by explaining that

Begin this trick by explaining that the goal is to get all three cups facing up after making exactly three moves. In each move two of the three cups must be flipped simultaneously. After this explanation, place the cups on a table in a row so that the center cup is facing up, and the two outside cups are facing down. This initial setup is critical for successfully performing the trick, and understanding how it works, but you should not draw attention to it. In fact, as soon as you set them up you need to start flipping the cups as practiced. The trick works because the audience concentrates so hard on your moves, that they don’t