A golfer, playing a round by himself, is about to tee off, and a greasy

A golfer, playing a round by himself, is about to tee off, and a greasy little salesman runs up to him, and yells, "Wait!
Before you tee off, I have something really amazing to show you!
" The golfer, annoyed, says, "What is it?
" "It's a special golf ball," says the salesman.
"You can never lose it!
" "Whattaya mean," scoffs the golfer, "you can never lose it?
What if you hit it into the water?
" "No problem," says the salesman.
"It floats, and it detects where the shore is, and spins towards it." "Well, what if you hit it into the woods?
" "Easy," says the salesman.
"It emits a beeping sound, and you can find it with your eyes closed." "Okay," says the golfer, impressed.
"But what if your round goes late and it gets dark?
" "No problem, sir, this golf ball glows in the dark!
I'm telling you, you can never lose this golf ball!
" The golfer buys it at once .
"Just one question," he says to the salesman.
"Where did you get it?
" "Ummm, I found it."