Or if you do the above, option #2... watch them rear end your car as you slam on your brakes, have to call a tow truck to get home and have no car for a few weeks/months. Then spend time trying to find a decent mechanic that can repair it to be as straight as possible, keeping in mind with a hard enough hit up the back of the car, it will never drive the same again.
Sorry but it shits me to no end when people suggest slamming your brakes on (even momentarily) as its plain stupid, and technically it should be your fault if you cause an accident. Even if the guy was too close behind you, you still caused the accident by slamming your brakes on.