I remember a story that a guy I worked with more than 10 years ago witnessed. A large truck was coming up to a set of lights, not speeding, and as the lights turned red he began breaking, normally. Suddenly a driver changed lanes in front of the truck who had to hit the anchors so hard, smoke poured from the tyres as he tried to avoid creaming the car in front. Foutunately, the left most lane was empty and he was able to get the truck into this lane and bring it safely to a stop next to her car. Next thing the truck door opens and the truckie gets out, onto the roof of the car, down onto the road and tells the driver in no uncertain terms that he was "not happy Jan". He then climbed back onto the roof and up into the cabin. The lights were now green and he drove off....
