4 x 4 owners who drive as if there car is made of glass. I drove down a local road with speed bumps last week and the 4 x 4 driver in front of me slowed down for each bump and tried to drive across it diagonally so only one wheel crossed it at a time, and it was not for the first time.
Likewise 4 x 4s driven by terrified women, mainly mums, who use the family wagon on weekdays to drive the children to and from school and the supermarket. They sit there terrified, hands gripping the steering wheel tightly, as whenim says, they park over two spaces, again usually diagonally, have great difficulty backing out because they have no feel for where the corners of the vehicle are and hog the centre of the road when driving.