Black Sunday can refer to a U-boat attack in 1918 off off the coast of New Jersey.
Or a day of wildfires in Australia in 1925, and again in 1955.
Or a dust storm that blew across the American Midwest in 1935.
Or the mishap-filled first day of business at Disneyland in 1955.
Or the mishap-filled first day of business at Denver’s new airport in 1998.
Or the death of Dale Earnhardt in 2001.
Black Monday can refer to a massacre in Dublin of English settlers in 1209.
Or a day of poor weather that ravaged the army of Edward III during the Hundred Years’ War in 1360.
Or a day of severe sandstorms in Australia in 1865.
Or a labor riot in London’s Pall Mall in 1886.
Or a currency crisis in 1894 for Newfoundland.
Or the Wall Street crash of 1929.
Or the shuttering of the Youngstown Sheet and Tube factor in Youngstown, Ohio, in 1977.
Or the day in 1978 when the San Francisco supervisor Dan White killed Mayor George Moscone and Supervisor Harvey Milk.
Or the day in 1987 when the markets recorded their biggest one-day drop.
Or the Temple Mount religious riots of 1990.
Black Tuesday can refer to more wildfires in Australia (1967).
Or the Estevan labor riot in Saskatchewan in 1931.
Black Wednesday can refer to a day in 1954 when air traffic controllers in New York City were overwhelmed, resulting in hundreds of delayed flights.
Or the day in 1992 when the British government pulled the pound sterling from the European Exchange Rate Mechanism.
Black Thursday can refer to (you guessed it) a day of wildfires in Australia in 1851.
Or the day in 1873 when Jay Cooke & Company declared bankruptcy, precipitating a serious economic crisis in the United States.
Or a day in 1940 that marked the peak of World War II’s Battle of Britain.
Or one of two unrelated days of heavy losses by Allied air forces in 1943.
Or the day in 1995 when Russia’s credit market plotzed.
Or the day in 2003 when riots convulsed Guatemala City.
Or the so-called Flash Crash of the markets in 2010.
Black Friday can refer to the Fisk-Gould financial scandal in the United States in 1861.
Or the deadly Eyemouth maritime disaster of 1881.
Or a violent suffragist protest in England in 1910.
Or more wildfires in Australia in 1939.
Or another air raid in 1945.
Or a labor riot at Warner Brothers’ studios in 1945
Or a massacre of people protesting the Shah in Iran in 1978.
Or a deadly tornado in Edmonton in 1987.
Black Saturday can refer to, yes, more wildfires in Australia (2009).
Or a violent crackdown of protesters in Georgia by the Soviet army in 1990.
Or a day of wildfires in Yellowstone Park in 1987.
Or a day of violence and massacres in Beirut in 1975.
Or the peak day of tensions during the Cuban Missile Crisis (1962).
Or a series of riots in Egypt known as the Cairo Fire (1952).
Or the Battle of Gazala in 1942, a devastating defeat for the British.
Or a massacre of Mau demonstraters in 1929 in Samoa by New Zealand forces.
Or the Battle of Pinkie Cleugh in 1547, a decisive victory of the English over the Scots.