The young man standing six feet behind me offers to buy my drink.

I’ve wandered up the river to Main Street to mail a letter at our small-town post office. Making an unplanned stop at the local coffee shop, I’ve asked for a golden latté and ginger scone. Rung up and ready to pay the shop’s one barista before she fills my order, I’ve realized my wallet must be sitting on the kitchen island back home. [...]