A hard-working engineer finally took a vacation.  While hiking in the
 mountains, he came upon a shepherd tending a flock of sheep.  Taking a fancy
 to the sheep, he asked the shepherd, "If I can guess how many sheep you have,
 can I have one?"
 
 The shepherd thought this request odd, but, knowing there was little chance of
 guessing correctly, agreed.
 
 "You've got 287 sheep," the engineer said to the shepherd's astonishment,
 since this was the correct number.
 
 The shepherd told the man he'd guessed correctly and to go ahead and pick out
 a sheep to take home.  But, as soon as the engineer picked up a small sheep
 and started to carry it away, the shepherd said, "Wait a minute.  You have to
 give me a chance, too.  If I can guess what you do for a living, can I have
 that sheep back?"
 
 Figuring there was little chance the shepherd would guess correctly, the
 engineer went along... only to be shocked when the shepherd said, "You're an
 engineer, right?"
 
 "How did you know?" asked the engineer.
 
 The shepherd said, "Put down the dog and we'll talk about it."