It was September 29, 2008, when the Dow Jones Industrial Average suffered what is now its second-largest point decline ever: it dropped 777.68 points during the day, after Congress’s rejection of the bank bailout bill. (Nearly 10 years later—on February 5, 2018—it closed down 1,175.21 points.) As bad as these declines were, however, they don't win the prize for the worst day ever in percentage terms. That would be October 19, 1987 (i.e., Black Monday), when the Dow lost 22.6 percent of its value. If we translate that into 2008 terms, the equivalent loss would be more than 2,500 points—or more than three times worse than the 2008 decline.