House Advantage

"This house," said the real estate salesman, "has both its good points
and its bad points. To show you I'm honest, I'm going to tell you about
both. The disadvantages are that there is a chemical plant one block
south and a manure plant a block north."

"What are the advantages?" inquired the prospective buyer.

"The advantage is that you can always tell which way the wind is
blowing."