The problem with internet journalism is that you never know whether you’re reading about a thing that is happening all around you or just hearing an echo. Case in point: “rolling coal,” the practice of modifying a truck to force extra fuel into the engine and produce billows of black smoke. Much like the knockout game, it is either a thing that jerks across the nation are doing because they hate the environment, or a legend we’re embracing because we consider ourselves victims of a world gone mad. Rolling coal is news or hysteria. It started with this article in Vocativ, which Dave Weigel wrote about in Slate on Thursday, causing everybody to write about it over the weekend.