A stock analyst and a Wall Street broker went to the races. The broker suggested to bet $10,000 on a horse. The analyst was sceptical, saying that he wanted first to understand the rules, to look on horses, etc. The broker whispered that he knew a secret algorithm for the success, but he could not convince the analyst.

"You are too theoretical," he said and bet on a horse. Surely, that horse came first bringing him a lot of money. Triumphantly, he exclaimed: "I told you, I knew the secret!"
"What is your secret?" the analyst asked.
"It is rather easy. I have two kids, three and five year old. I sum up their ages and I bet on number nine."
"But, three and five is eight," the analyst protested.
"I told you, you are too theoretical!" the broker replied, "Haven't I just shown experimentally that my calculation is correct?!"