Trader Brian Jones on Twitter: "Found this one a friends page. S&P 500 has only been down 10% in a week four other times since WWII; October 1987, April 2000, September 2001, and October 2008." / Twitter

Found this one a friends page. S&P 500 has only been down 10% in a week four other times since WWII; October 1987, April 2000, September 2001, and October 2008.