1987 Black Monday is the name given to Monday, October 19, 1987, when the Dow Jones Industrial Average (DJIA) fell dramatically, and on which similar enormous drops occurred across the world. By the end of October, stock markets in Hong Kong had fallen 45.8%, Australia 41.8%, the United Kingdom 26.4%, the United States 22.68%, and Canada 22.5%. (The terms Black Monday and Black Tuesday are also applied to October 28 and 29, 1929, which occurred after Black Thursday on October 24, which started the Stock Market Crash of 1929.) The Black Monday decline was the second largest one-day percentage decline in stock market history. The largest one occurred on Saturday, December 12, 1914, when the DJIA fell 24.39%. However, in that case, the New York market had been closed since July due to the outbreak of the First World War. The greatest point loss in DJIA history was on Monday, September 17, 2001, 684.81 points, six days after the terrorist attack on New York City.
You might want to put this picture up on the wall next to your trading desk. It will be a nice reminder of what's still possible in today's markets.