Marie81, in terms of achieving longevity I think you could listen to felt-tip's advice. Playing games with irate drivers could get you hurt by them and definitely hurt in a collision, also you can injure someone not involved in this behaviour i.e. a pedestrian or cyclist. Your proposed reactions sound defensive and ego-based, however the public roads are not a place for them, you really heed to understand this. Also, what if the 'crazy' guy behind you is rushing to a hospital or to catch a flight, anything which you may not be aware of but are ready to make a rash judgement on. If it's just as easy to let him pass then do so, if he's an idiot let him be a lone idiot, not one of a pair. Unless you have never rushed anywhere in a car or broken the speed limit you don't even have half a case with your views I'm afraid.