A friend of mine used their lights to alert a car from pulling out and he ended up going into the other car. The other car told police he thought he was being "flashed out" and my friend admitted to police he had used his lights but as a warning not as a flash out! My friend ended up taking blame for the accident, but if he had used his horn, it would've been different!
I use my horn quite aggressively, i must admit, if someone goes to pull out, pulls out or is being a bit of a #### on the road. Usually there is some foul language to go with the horn!
