I had an extremely scary/near-violent event yesterday, that made me thank God I carry either my LC9 (which I had on me) and/or MP9 at all times in my vehicle. Details below.
I was driving home after work, on a road where the speed limit is 45 MPH. I was stopped at a red light, waiting it for it to turn green. When it finally did turn,I accelerated, slowly, to get up to speed (I drive an SUV, and am not a fan of wasting gas and $$$ by doing the "Jack Rabbit start" from a red light). I was going about 35, maybe 50 yards past the intersection, when I see a huge Cadillac Escalade come flying up behind me; he saw the light turn green from a distance and did not slow down, not taking into account the fact that the light had just turned green and that I would need a little time to accelerate up to speed. Anyway, he kept on coming, then at the last second, slams on his brakes and serves into the grassy median. Then he yanks his car back onto the road, cuts in front of a car in the other lane, floors it, and then serves right over in front of me without using his blinker. Then he slams on the brakes, to try to "Brake Check" me. Luckily, I had anticipated this guy might not be sane, and had already slowed down when I saw him trying to pass me. So I think, "Ok, all is good, he's in front of me. Problem solved right?"
WRONG! At the next light, he backs up into me, putting his rear bumper against mine. So I back up, but he keeps coming, and pins me between him and the car behind me. At this point, I had my hand under my seat (I have a seat holster made by DeSanti, called "the kingston") and gripped my LC9. He flings open his car door, and stomps back to my car. He pounds on the window and starts yelling. I then pulled my LC9, pointed it at him, rolled down my window and calmly said "Sir, get back in your car or I will be forced to shoot."

He said some expletives but got back in his car, and turned when the light turned green.
I sincerely think that without my handgun, this guy would have attempted something crazy. I was sure glad I had it.
I couldn't get a plate number, because he was missing his rear plate, but I did call the local Sheriff Office and inform them of the time and location of the incident, and the make and model of the car. I noticed that the intersection had red light cameras, so hopefully that recorded the incident and they can find the perp. I'd be happy to testify in court against him!
Scary!!!!!!