I've had it more than once that a driver tries to deliberately drive me of the road. In one case where I stopped and wanted to wait until the driver is gone, he stopped, got out of the car, and wanted to start a fight. The reason in that case was that he was angry, as I overtook the waiting cars at a red light.

That's one of the reasons why I typically have a heavy u-lock and a pepper spray with me when cycling.