People who speed up toward you on a roundabout, as if they are pretending they are going to crash into you. Even when you went in a gap, but they get annoyed because they sped onto the roundabout.
People at junctions who hesitate, hesitate, hesitate, and then pull out in front of you.
People who tailgate. Seriously, that’s dangerous mainly for you, moron.
People who speed up behind me during a merge in turn, and then don’t let me in. There was a gap. I was ahead of you. Just let me in FFS. Also happens when I’m in the inside lane and rather than taking the obvious gap, they try and get round one or two last cars, overtaking again to force their way in.