Beverly is 90 years old. She's played golf every day since her retirement 25 years ago. One day she arrives home looking sad.
"That's it," she tells her husband, Gus, "I'm giving up golf. My eyesight has become so bad that once I hit the ball I can't see where it went."
Her husband makes her a cup of tea, and says, "Why don't you take me with you and give it one more try."
"That's no good" sighs Beverly, "you're a hundred and three. You can't help."
"I may be a hundred and three," says Gus, "but my eyesight is perfect."
So the next day Beverly heads off to the golf course with her Gus. She tees up, takes a mighty swing and squints down the fairway.
She turns to the husband and says, "Did you see the ball?"
"Of course I did!" replied Gus, "I have perfect eyesight".
"Where did it go?" says Beverly.
"I don't remember."