Little Johnny watched the science teacher, as she put four worms into four separate jars. The first worm was put in a jar of alcohol. The second worm was put in a jar of cigarette smoke. The third worm was put in a jar of sperm. The fourth worm was put in a jar of soil. After one day, these were the results: First worm in alcohol - dead. Second worm in cigarette smoke - dead. Third worm in sperm - dead. Fourth worm in soil - alive. The science teacher asked the class, "What can we learn from this experiment?" Little Johnny was the first to raise his hand. He said, . . . . . . "As long as you drink, smoke and have sex, you won't have worms."