Arabian horses go through rigorous training in the deserts of the Middle East.
The trainers require absolute obedience from the horses, and test them to see if they are completely trained. The final test is almost beyond the endurance of any living thing. The trainers force the horses to do without water for many days. Then he turns them loose and of course they start running toward the water, but just as they get to the edge, ready to plunge in and drink, the trainer blows his whistle. The horses who have been completely trained and who have learned perfect obedience, stop.