Let all the cars pass you at the star of the race. Line up on the start/finish line so that the front of your car is facing the wall and the back of it is facing the pits. Hold the brakes and wait for the other cars to come around. With you parked out on the track and the other cars coming around, they will hit you. When they do, you and other cars will go flying up in the air. Sometimes this takes out four or more cars, and perhaps even all of them.