They call it "Rolling Coal," and it's the latest salvo in the war on the environment and anyone who even appears to care about it. These jackasses modify their diesel pickup trucks to dump huge plumes of thick, black (and poisonous) smoke - then use it to annoy or intimidate the rest of us. Cyclists are reportedly a popular target, as are Prius drivers. There was a pretty good article in the NYTimes this month about it. It happened to me once. Has it happened to you? Leave a comment - share your tale.