Here's how you get rid of tailgaters, and make money, too!
Once someone is hard on your tail (that sounds dirty, doesn't it?), just watch them closely in your rear view mirror. (Make sure they are driving a car that looks as if it is insured; i.e., do not do this if the car in question is a 1978 Monte Carlo being driven by Tyrone in a do rag.) Anyway, it won't be long until you see them look away and take their eyes off the job at hand (driving). Immediately slam on your brakes. Unless they have very fast eye/hand coordination, they will run into you.
At this point, you have two choices. You can either be very smug as you get out of your car and say, "My, my. I don't think you should have done that."
Or, you can fall out of your car while screaming in pain. This is where the real money comes in.
Either way, you will have probably cured that person of tailgating.