Step one: Order, get, and where this T-shirt
http://www.zazzle.com/hemi+prius+gifts

Step two: Buy and plug this thing in the car.
http://www.youtube.com/watch?v=b9XAC-BvUyo

Step three: Wear the T-shirt to a bar, and tell the drunk guy beside to read the T-shirt, then bet him your Prius sounds better than his truck.

Step four: Take him for a ride around the parking lot, collect bet proceeds.