The reason why you should get a gun or at very least drive to the police station if this happens.

Never stop if someone is tailgating you and driving aggressively. Chances are high they smoke meth and think you are a lizard person. Just get out of their way and if they chase you go directly to the police department if you have no gun and run right into their information booth crying for help like the little bitch or diagnosed crazy person that you are. LoL Otherwise be a man and pull your fucking gun out on this sociopath.