friday nights, u get a lot of crazys - i think people get over happy that its the weekend....and they have to get home in a hurry to have a wank
on a serious note, I know what you mean....I have seen it happen to other motorists before. Only thing that you can do is just be alert, obey the speed limits.
The other thing is as well, if these pricks see someone driving a good car, they always try to give a bit of stick to instigate that person. Just dont even look at them - let them be the idiots that they are.