A man was on the golf practice course, when the club pro, Maury, brought an important looking man out for a lesson. Maury watched the guy swing several times and started making suggestions for improvement, but each time the pupil interrupted with his own versions of what was wrong and how to correct it. After a few minutes of this interference, Maury began nodding his head in agreement. At the end of the lesson, the man paid Maury, congratulated him on his expertise as a teacher and left in an obviously pleased frame of mind.
The observer was so astonished by the performance that he had to ask, "Why did you go along with him?"
"Son," the old pro said with a grin as he carefully pocketed his fee, "I learned long ago that it's a waste of time to sell answers to a man who wants to buy echoes."
-J.F. Moore, Readers Digest