A group of animals got together in the forest one day and decided to start a school. There was a rabbit, a bird, a squirrel, a fish, and an eel. They formed a board of education and tried to create a curriculum. The rabbit insisted that tunnel digging in the ground be in the curriculum. The fish insisted on swimming. The squirrel insisted that perpendicular tree climbing be included, and the bird wanted flying.
They put all these courses together and wrote a curriculum guide. Then they insisted that all of the animals take all of the subjects. Although the rabbit was getting an A in tunnel digging, perpendicular tree climbing was a real problem for him; he kept falling over backwards. Pretty soon he became brain damaged from these falls, and he couldn’t dig well any more. He found that instead of making an A in tunnel digging, he was making a C. And, of course, he always made an F in perpendicular climbing.