Elderly gentlemen (often Asian for some strange reason) driving equally elderly cars and moving stubbornly into the road, regardless of whether there is anything out there at the time. Oh, and anyone with a new SUV, because he/she hasn't got the faintest idea how wide the thing is anyway and won't until they either a) alter the shape of it by dinging a wall/parked car/pedestrian or b) knock me off my bike.