"A farmer who had only two impotent old bulls bought a new, young, vigorous bull.

Immediately the stud began mounting one cow after another in the pasture. After watching this for an hour, one of the ancient bulls started pawing the ground and snorting.

"What's the matter?" asked the other. "You getting young ideas?"

"No," said the first bull, "but I don't want that young fellow to think I am one of the cows."