Been followed a few times by idiots cussing and shaking fists, but none to the point of needing to take further action.
I second the notion that sometimes merely having a cell phone at your ear will cool the other driver off a bit. I was turning left behind some stupid chick. She had a manual transmission and was slow to shift so I had accelerated a little too much/too close to her rear bumper. I immediately let off the gas to let her shift her way farther ahead and then proceed at a safe distance. But she thinks she's gonna start dicking around with me. Keep in mind she's in a little Toyota and I'm in a big Suburban. She keeps slamming on her brakes in front of me trying to get me to hit her. I simply pick up my phone, pretend to call the cops. She turns into a neighborhood not long after seeing this and I go on my merry way. Whether that was her intended turn I do not know, but I can't help but think that she didn't really want to have to cops called on her.
As for the scenario of being followed late at night: I've always wanted to take the idiot for a long ride around the highway loop that surrounds our city. 30 miles roughly, again and again and again.
My Suburban is 4 wheel drive so I can probably go where a lot of others can't. In fact, we take it to one of our rental units in the inner city simply because it's usually the biggest vehicle around and if nothing else we can use it as a battering ram to get away...or drive up on the front lawns. The other car is a slightly modified 5.0 Mustang. If possible, I'd rather pull 4th or 3rd and wave goodbye to the idiot in the rearview. If I'm on the local loop highway, I can get far enough ahead to get off on an exit before he would even know it. From there, I know about a gajillion ways home across the surface streets or back on the highway from a differnt point (though I probably wouldn't do that for fear of running into him again).
Of course there's always the PD station, public place, etc.
Tell me, how does one find out where another lives simply by knowing the tag number? To my knowledge, without a LEO friend or BMV friend, there is no public access to that information...at least in my state.