"It's impossible to lose," I said. "If you hit it into the rough it sends out a GPS signal so you can track it down."
"That's great," he replied, "but what happens if you it hit into the water?"
"Simple. The ball floats to the surface and tracks its way back toward you and you just scoop it back out."
"Brilliant!" he said, "Where did you get it?"
Spoiler:
