(Buffett at Columbia University)
"I would like you to imagine a national coin-flipping contest." Let's imagine all 268 million people in the United States are asked to wager one dollar on their ability to call the flip of a coin. "If they call correctly, they win a dollar from those who called wrong." After each flip the losers drop out, and on the subsequent flip the stakes multiply. Each person has a 50-50 chance of calling each flip and approximately half of the people will lose and drop out each round. After ten flips there would be approximately 260,000 people that had successfully called ten consecutive coin flips. After 20 flips, based purely on chance, there would be approximately 250 people that had called 20 consecutive coin flips - a seemingly miraculous feat.
The surviving callers would have over one million dollars each at that point. Press coverage and inquiries about their coin calling ability would increase with each successive flip. Several callers might even attempt to profit from their good fortune by writing books on coin calling, setting up 900 phone lines, or by sending mass mailings or spam Email solicitations offering to share their secrets with intrigued members of the public."