A man was driving in his BMW Convertible when he approached a farmer with a huge herd of sheep. The man stopped and asked the farmer "if I can tell you exactly how many sheep you have, will you give me one of them?"
The farmer shrugged his shoulders. "Okay."
So the driver got out his laptop, made a connection with the GPS satellite and instructed it to take a high resolution photograph of his area and send it back to the PC. The man digitized the photo by sending it to the his virtual scanner and then sent that output to a pattern recognition program. After that, he looked up and told the farmer "you have 1,647 sheep."
"You're right," he said, and the young man laid his hands on the nearest one. Then the farmer asked "if I can tell you what kind of a job you have, can I get my animal back?"
The man agreed, and the farmer told him "you're a consultant."
"That's right!" the man explained, completely amazed. "How did you know?"
"Well, no one called you, but you came anyway. You answered a question that no one asked and gave me an answer that I already knew. And without knowing anything about my business." He paused. "Now give me back my dog."