Ah, regional differences. :) Over here it's usually an Audi or Mercedes that cuts you up violently or a Volvo that cuts you up only to hinder you for miles afterwards driving 10 mph below the limit. BMW and Porsche seem to harbor some of the more polite drivers.
But the worst drivers drive a Dacia Duster. It's the cheapest SUV-like thing on the market, made by Renault and priced well below even Hyundai or Ssangyong. When you see one of those coming your way, no securities in life are certain. They'll either hinder you, drive unnecessarily slow, cut you up, drive way too fast for the circumstances, talk on the phone while eating and smoking, try to run into you for claiming your right of way, illegally claim right of way or park up across two parking spaces (preferably reserved spaces for the handicapped). Someone a couple of houses down from my girl's home has one. He parks it on a deliberately muddy section of his front lawn to make it look more off-roady while it's a FWD 75 bhp 1.5 diesel with maybe 6 inches of true ground clearance. That's just sad.