Hard to imagine, but apparently some people in the USA tune diesel powered engines to produce even more exhaust flumes. The goal of this very visible form of intended air pollution is to entertain and to protest against environmentalism. Popular targets are Prius- and Tesla drivers, pedestrians, cyclists, protesters,… Luckily this practice is even in the United States of Trump illegal! By the way: There’s no such thing as cancer and for sure the ears of the youngster are very well protected!!