By chance, and that's the way I like it, I happened upon Mister Vernon L. Giles, from Chatham, Virginia, riding his older horse and towing his other, along the main highway passing through the town.
He was headed to an open field nearby, to let the younger horse run loose and get some exercise. Vernon told me the way he got the horse to come to him after dashing to an fro in the field, was to whistle loudly...and that would trigger a memory in the horse's head that there was a tasty hard biscuit waiting for him in Vernon's pocket. He demonstrated this to me and it worked. Point of this short story is that you never know what you'll see or who you'll meet when you travel around locally around your home, usually with no specific destination in mind.
Vernon, by the way, is not only a fine horseman, but an author. He just completed a well-reviewed novel titled "Tobacco Moon", a story about the tobacco-growing, Piedmont Region of Virginia and North Carolina. I've not purchased it (yet) but it sounds like a good read.