0 the events in October 1929, when shares on the New York Stock Exchange lost a lot of their value, causing serious economic problems in the US and Europe and leading to the Depression:
1 the events of Monday, October 19, 1987, when shares on the New York Stock Exchange lost 508 points, causing problems in stock markets around the world
2 the events of Monday, October 27, 1997, when shares on the New York Stock Exchange lost 554 points causing problems in stock markets around the world