"The Perfect Golf Ball" joke

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? ”
“I found it. ”