I had just gotten into my car after making a purchase at a local hardware store, when I spotted someone placing a duck on the driver's door handle of the Jeep Wrangler parked next to me.
I lowered my passenger window and commented how cool it was to be witnessing this. Scant minutes later, the Jeep's owner approached, and I again commented how cool it was to see this happening. The recipient almost certainly saw the giver but had no idea they were the generous party. Of course I said nothing to reveal their identity.