Old Golf Balls

Joe goes out for a quick round of golf, and at the first tee, Bob is about to tee off.  Bob takes a brand new ball out of his bag, unwraps it and places it on the tee and slices into the trees.

"Darn!"  He reaches into his bag and takes out another brand new ball, unwraps it, and tees it up.  Whack!  He hooks it a mile into the trees.

"Darn!"  He stomps back to his golf bag for another ball.  Joe approaches him and says, "Umm, excuse me, but I noticed that you're losing a lot of brand new balls.  Why don't you use an old one until you get your swing back?"

Bob looks at Joe and laments, "Because I've never had one!"