"Playing Blind" joke

Stevie Wonder and Jack Nicklaus are in a bar. Nicklaus turns to Wonder and says, "How's the singing career going?"
Stevie Wonder says, "Not too bad, the latest album's gone into the top 10, so all in all I think it's pretty good. By the way, how's the golf?"
Nicklaus replies, "Not too bad. I m not winning as much as I used to but I'm still making a bit of money. I had some problems with my swing, but I think I've got that worked out now."
"I always find that when my swing goes wrong I need to stop playing for a while and think about it, then the next time I play it seems to be all right," says Stevie.
"You play golf!?" asks Jack.
Stevie says, "Yes, I've been playing for years."
"But I thought you're blind! How can you play golf if you are blind?" Jack asks.
"I get my caddie to stand in the middle of the fairway and call to me. I listen for the sound of his voice and play the ball towards him, then when I get to where the ball lands the caddie moves to the green or further down the fairway and again I play the ball towards his voice," explains Stevie.
"But how do you putt?" Nicklaus wondered.
"Well," says Stevie, "I get my caddie to lean down in front of the hole and call to me with his head on the ground and I just play the ball to the sound of his voice."
Nicklaus says, "What is your handicap?"
"I play off scratch," Stevie assures Jack.
Nicklaus is incredulous and says to Stevie, "We must play a game sometime."
Wonder replies, "Well, people don't take me seriously, so I only play for money, and I never play for less than $100,000 a hole."
Nicklaus thinks it over and says, "OK, I'm up for that. When would you like to play?"
"I don't care - any night next week is OK with me."