I was in PA amish country when I was young and still would go for a run now and then. After works one day, I decided to go for a run for some stress relief. It was dusk\dark, and there was lots of rocks on the side of the road. I remember thinking to my self to be extra careful not to step on one of the rock, a twisted\sprained\broken ankle would be bad.
The next morning as I drove to work on that same road, I realised that the 'rocks' weren't really 'rocks' at all.
Still didn't want to step on them.