Does my head in. The ahole who flies up the outside to get a one car ahead advantage, only to run into a heap of parked cars or a 2 lane into one situation, often knowing that's exactly what's going to happen to them. Then, they want to push in....no indicator ....nothing... and you're expected to jump on the brakes and accede to their behaviour.
I have a rule with those people. If they use an indicator, I let them in. Even if they are dheads. At least they've shown a little bit of courtesy. No indicator = zero courtesy.....so go *** yourself.