"This house," said the real-estate salesman, "has both its good points and bad points. To show you I'm honest, I'm going to tell you about the disadvantages - there is a chemical plant one block south and a slaughterhouse one block north."
"What are the advantages?" inquired the prospective buyer.
"The good thing about it," said the agent, "is that you can always tell which way the wind is blowing."