A few weeks ago I was riding on a suburban rail corridor bike trail and I heard what sounded like a yell and a gunshot. Scared me badly. As I was riding onward, a couple cyclists came my way I told each what I had just experienced. One cycled on, and the other said, "I'm out for fun today, so I'll go somewhere else. I was freaked out enough that I just kept riding. By the time I thought that, oh, I should have called 911 about it, I couldn't remember landmarks or where exactly it had happened. It was in a light manufacturing area the trail passes through, but how to explain it? So, I ended up not reporting it.