How do you make a technical, abstract product benefit interesting? Fuel efficiency is not something you can get people particularly excited about to find out more. Volkswagen did it by turning the entire experience into a roulette game; getting people to guess how far the new Volkswagen Golf BlueMotion will run on one full tank of gas. The winner gets to win a car. As each person could only make one guess, participants had to find out more about the car, technology and route in the process, making it an absolutely engaging experience.