car shock

As I was getting out of the car today, I got shocked again. The feeling is just like the zap from Vegas when you accidentally bump into someone. When two objects touch, if one has a charge and the other is neutral, electrons will move to whichever object is more positive. This is because objects want to stay neutral. In the situation with my car, I'm pretty sure that I'm neutral and the car door must have a negative charge. I'm probably neutral because I don't remember doing anything that would cause me to gain or lose electrons. The rubber on the car door might have gotten some electrons from the metal part of the car when I opened the door, giving it a negative charge. (The rubber is an insulator so electrons would not flow throughout all of it.) The electrons passed from the door to my hand, which is why I think that the zap occured. (But it's weird how my car only seems to shock me, not anyone else that rides in it.)