When they're driving? Just this morning I was driving to work. There's a long queue going in the opposite direction so a car a way ahead of me decides to turn around... In doing so however she starts to reverse into the middle of my lane, seemingly not noticing or caring to look. So I pipped her. Not aggressively, just a double toot, 'look behind you, I'm here'. She stops and I think nothing else of it.
Until 5 minutes later at the lights ahead I glanced in my rear view mirror and there she is angrily mouthing and waving her hands at me. Slightly shocked and bemused I didn't really know what to do but it did make me question, why do people get so worked up when people say or do anything to them they don't like? Did she expect me to slam my brakes on in the middle of a 40 road. Was it so offensive to be tooted a warning not to reverse into me?