There are bad days, and then there are very bad days, and Monday is looking particularly bad for the stock market...
https://www.barrons.com/articles/dow-jones-industrial-average-set-to-drop-800-points-what-history-says-happens-next-51582553267
https://www.barrons.com/articles/dow-jones-industrial-average-set-to-drop-800-points-what-history-says-happens-next-51582553267