Intuition
The difficulty of many brain teasers relies on a certain degree of fallacy in human intuitiveness. This is most common in brain teasers relating to conditional probability, because the casual human mind tends to consider absolute probability instead. As a result, controversial discussions emerge from such problems, the most famous probably being the Monty Hall problem. Another (simpler) example of such a brain teaser is the Boy or Girl paradox.
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Famous quotes containing the word intuition:
“Well, intuition isn’t much help in police work. Facts are what we need.”
—Crane Wilbur (1889–1973)