I'm probably being unreasonable. The last couple of days I've had people flashing lights at me as I drive to and from work. At first I thought it was directed at someone else but then it happened when there were no other cars on the road. I checked my lights: they were not on full beam and appeared to be working correctly. I was not, as far as I can tell, driving like an arse. So what all these people actually achieved was simply making me massively paranoid but in no way enlightened as to what the problem might be. Unless we develop some form of basic morse code to pass on messages with our lights, it really isn't very helpful to flash at people is it?