Mostly peoples garbage and roadkill. A few years ago I spotted a black canvas sunglass case on the shoulder, in it was a pair of expensive Oakleys with several replacement lenses. Brought it to the police station. They listed in local paper as designer sunglasses, would give back to owner with proof of ownership or if could ID make and style. No one claimed them, so they were mine. They are now my favorite shades to wear when riding. Like the different lens tint and color options for varying conditions.