And then someone from the opposite lane stirs into yours and in the last second reverts back to his lane. That's an example of stupidity/unawareness/ call it what you will on that driver's part. When you see a driver doing something on the road that upsets you in any way how do you react? 1. Curse him under your breath. 2. Curse him out loud. 3. Reciprocate in action. (if someone overtakes you in a dangerous manner, you'll speed up just to overtake him yourself) 4. Curse + Reciprocate. 5. No reaction.