Special Gifts, Devices, and Techniques : Page 139
It seems one day Bernard Shaw faced this situation when Galsworthy had said to him something like this: "Mr. Shaw, if you keep writing the way you do, you will soon not have a friend in the world." To which challenge G. B. S. gallantly responded, "And, Mr. Galsworthy, if you keep writing the way you do, you will never make an enemy all your life."
This sort of anecdote, because it bears on the topic, is appreciated by people, even if they do not find it especially funny. If you tell stories that explain or illustrate the subject, you cannot easily go wrong. Even a story heard from you before is acceptable when it is used to bear upon a new situation.