" Eric Dutro, Chris Morris, and a handful of other boys were pretty much the core of the TCM, but a dozen more were often associated with the TCM as well, whether they sported trench coats or not. Eric and Dylan were not among them. Each of them knew some of the TCM kids, and Eric, especially, would become buddies with Chris. That was as close as they came. Eventually, after the TCM heyday was over, Eric got himself a trench coat. Dylan followed. They wore them to the massacre, for both fashion and functional considerations. The choice would cause tremendous confusion. "

― Dave Cullen , Columbine