It seems there was a mother and father who were very worried about the future welfare of their 10 year old twin sons. One son was such an extreme optimist

that he would often take big chances. His parents were afraid he wouldn't survive to adulthood. The other son was such an extreme pessimist

that he would rarely take even small chances. His parents were afraid he would accomplish little if anything in his lifetime. These parents brought their sons to a psychiatrist for examination.
The psychiatrist was so puzzled by the behavior of these boys that he designed an experiment to help him evaluate the extremes of their respective optimistic and pessimistic behaviors. He put the pessimist

into a gymnasuium loaded with all kinds of very popular toys, games, and friendly playmates. He put the optimist

into a barn loaded only with manure. He told each one he would be back in 4 hours to see how they were doing.
Four hours later he found the pessimist

cowering in a corner of the gymnasium. When asked why, the pessimist

said, I'm afraid of breaking something.
Upon arrival at the old barn, he saw the optimist

hurling manure out of the barn. When asked why, the optimist

said, "With all this shidt, there's got to be a pony here somewhere!"
Who accomplishes the more valuable objectives: optimists

or pessimists