sidewalks

I ran out of stamps, so I walked down the hill to the post office. I was staring at the parking lot as I walked away, and as soon as I reached the sidewalk, there appeared dark splotches, a little more than an inch in diameter. In just a few squares of pavement, soon there were at least a half dozen per square. Past the next building, I reached the corner of the high school yard. The density of the black patches increased. Chewing gum! After I crossed the second crosswalk, they almost completely disappeared. None at all on the sidewalks on my street. So the kids must chew gum on the way to school, and throw it out as they arrive. Yuck! I'm going to walk on the other side of the street next time.