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Hall of Fame football coach John Madden, in a documentary about Vince Lombardi, told a story about how, as a young assistant coach, he attended a coaching clinic where Lombardi spoke about one play: the power sweep, a running play that he made famous with the Green Bay Packers in the 1960s. Lombardi held the audience spellbound as he described that one play for eight hours. Madden said, “I went in there cocky, thinking I knew everything there was to know about football, and he spent eight hours talking about this one play. . . . I realized then that I actually knew nothing about football.
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Annie Duke (Thinking in Bets: Making Smarter Decisions When You Don't Have All the Facts)