I had a young girl in an old renault push into my lane and almost push me into the armco, but she didn't see me, well, she would have if she checked her outside mirror, so I rode up beside her and broke her mirror off, and held it up so she could see it when we were stopped at the lights.
Sadly she still couldn't see it, as she was busily looking the other way. Sounds a bit mean I suppose, but I was only inches from being smeared along that armco, and I doubt she would have learned anything if I just let her get away with it........
That Vulcan thing reminds me of a joke a young English army officer, Robert Lawrence, told me about the Falklands war, have you heard it?