A midwest farmer was describing his lifestyle to a touring group of city folks. "One of the benefits of this profession," he explained, "is that we have built-in weather predictions."
"What do you mean by that?" asked one inquisitive visitor.
"When the cows are standing," the farmer explained, "it means no rain is likely for the next twenty-four hours. When they're lying down, it means it's going to rain."
"On our bus trip," another visitor piped in, "I saw half the herd standing and the other half lying down. What does this mean?"
The farmer flashed a smile and answered, "That means half of them are wrong."