There were once two identical twins. They were alike in every way but one. One was a hope-filled optimist who only ever saw the bright side of life. The other was a dark pessimist, who only ever saw the down side in every situation.
The parents were so worried about the extremes of optimism and pessimism in their boys they took them to the Doctor. He suggested a plan. “On their next birthday give the pessimist a shiny new bike, but give the optimist only a pile of manure.”
It seemed a fairly extreme thing to do. After all the parents had always treated heir boys equally. But in this instance they decided to try to Doctor’s advice. So when the twins birthday came round they gave the pessimist the most expensive, top of the range, racing bike a child has ever owned. When he saw the bike his first words were, “I’ll probably crash and break my leg.”
To the optimist they gave a carefully wrapped box of manure. He opened it, looked puzzled for a moment, then ran outside screaming, “You can’t fool me! Where there’s this much manure, there’s just gotta be a pony around here somewhere!”