Speaking of which, here in the States (the Southern US, North Carolina to be specific), when this happens, I blink my lights, as a good driver should, to get the offending person to move. More often than not, this inspires outrage in said offending driver. Which brings me to my corollary pet peeve: people who do not know how to drive (and are driving), are inconsiderate drivers, or who are too busy doing other things (like gossiping on the phone to their girlfriends) to be bothered to drive.