Go to Single Event, and then play Bomb Tag. Then make sure there are 3 bombs, on 60 seconds untill they explode. Then take the Pickup truck. Now, find a car with a bomb. Try to get the bomb, then give it back, then get it again, then give it back. If the bomb reaches less than 10 seconds, drive away. Make sure you don't have a bomb. Now do this over and over and your money keeps going.