Is it a 180 out of reverse or a forward one?
If it's the reverse one, accelerate hard in reverse gear (in a straight line) turn the wheel full lock whilst dipping the clutch, applying lots of handbrake and changing into a forward gear (1st or 2nd.. 2nd is better) whilst ALSO turning the wheel back to opposite lock, releasing the handbrake and flooring it in the aforementined forward gear. Easy Peasy eh?
Forward one, floor it and bang the handbrake on as hard and fast as you dare whilst turning the wheel lock to your desired direction.
The latter is more likely to make you flip and roll, it all depends on the road conditions, your speed and how high your C of G is... Don't try this in a Land Rover for instance..

BTW if it's rear wheel drive car, always dip the clutch whilst the handbrake is on or you could end up with a rather embarassing stall.
EDIT: DISCLAIMER: Don't try this at home kids, Charlottesdad takes no responsibility for wrecked cars, smashed up bus shelters etc.. ;D
Last edited by MWISimmer on Tue Jun 19, 2007 3:04 pm, edited 1 time in total.