I was driving the car a couple of weeks ago coming upto a roundabout in the right hand of two lanes, the right hand one being marked for traffic to go straight across, the left hand one for traffic turning left.
Two bikes then appear from behind, in the left hand lane, the first one goes straight across. The second, now just behind and stuck in my blind spot, opts to cut across the back of me and overtake ridiculously close to the central reservation, and almost wipes himself out. He then gives me the finger, all because he couldn't or didn't read the road signs.
Made me angry that I could've knocked him, and his passenger, off. Took me a while to calm down and think he'd just assumed that the roundabout was like most others in that you normally go straight on in the left lane.