In a book by John Fisher, Never Give a Sucker an Even Break (Pantheon Books, 1976), we find the following problem:

What is the probability that you win? Remember, the sucker bets that he can roll out three black olives without getting one of the green olives.

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Take a small opaque bottle and seven olives, two of which are green, five black. The green ones are considered the "unlucky" ones. Place all seven olives in the bottle, the neck of which should be of such a size that it will allow only one olive to pass through at a time. Ask the sucker to shake them and then wager that he will not be able to roll out three olives without getting an unlucky green one amongst them. If a green olive shows, he loses.