I had a guy in a red pickup truck "roll coal" on me three days ago. That is, he slowed down to pass me and then stomped on it or whatever he did to cause almost impenatrably black clouds of smoke to envelope me. Obviously a diesel truck that's been modified to pump way more fuel than it could burn. I'd seen Youtube videos where someone did this to someone, and was kind of shocked that some dickhead did it to me. I fantasized about tracking down that truck, putting on my ninja suit, and slashing his tires in the middle of the night. I wouldn't do it, of course, but one just can't help at least thinking it. It's hard to believe such people actually exist, sharing our air. We call these people "oxygen thieves."