This morning I stopped at a local coffee place (Froggie's) for a refill cup of coffee. The clerk told me that "that gentleman there" was paying for all coffee this morning. I said, "Really?" and thanked the guy. He wished me a good day.
I admit I wondered if he was selling something, and religion came to mind, but I think it's entirely possible that he just wanted to do something to brighten people's Friday.