This is a simple trick with three "lucky coins" that becomes gradually more puzzling until the surprise, stunning finish.
From the man who needs to carry three lucky coins! A whimsical rationalization for carrying three half-dollars. With them, you win an intellectual battle with your audience by using repetition against them! (Of course, you don't reveal there's a battle until you prevail!)
Learn how to build to a climax and set-up the payoff so it comes as a complete surprise.