Don Quixote vs. The Windmill
Once upon a time Don Quixote and Sancho Panza spotted a whole lot of windmills rising from the open plain...
"And no sooner did Don Quixote see them that he said to his squire, 'Fortune is guiding our affairs better than we ourselves could have wished. Do you see over yonder, friend Sancho, thirty or forty hulking giants? I intend to do battle with them and slay them. With their spoils we shall begin to be rich for this is a righteous war and the removal of so foul a brood from off the face of the earth is a service God will bless.'
"'What giants?' asked Sancho Panza.
"'Those you see over there,' replied his master, 'with their long arms. Some of them have arms well nigh two leagues in length.'
"'Take care, sir,' cried Sancho. 'Those over there are not giants but windmills. Those things that seem to be their arms are sails which, when they are whirled around by the wind, turn the millstone.'"
But the brave Don Quixote couched his lance and galloped on, his squire crying after him the while.