Gain some speed in a car and hold HANDBRAKE until you have completed a full 180. Just before you complete the 180, release HANDBRAKE and hold BRAKE, which will spin you the next 180 degrees. Obviously you will end up facing the direction you were before the attempt. However, some vehicles cannot do this. Also with some vehicles holding BRAKE will spin you back the way you came while using the HANDBRAKE, resulting in back-to-back 180s.