I was walking to my bus after work yesterday and saw a cd lying on the sidewalk, next to the grass. I walked a few more steps and saw another cd on the sidewalk. It said "56478" on it. I thought "Maybe someone is trying to get people to listen to their band so they're just putting cds strategically on the sidewalk" and I walked a few more steps and saw another cd that said "56479" and a few steps later another one that said "56480." I thought "they're going up in numbers. They're really trying to work some kind of gimmick here. I bet it's hiphop" (because I was kinda near the ghetto. Just being honest). I saw a dozen more and then I realized that they were metal discs drilled into the sidewalk and were some kind of city electrical or plumbing markers.