During the rock solid growth of the Reagan years?
Oct of 1987. What few fail to remember or care to self study that the big crash that year simply brought the market back to where it had been in January of that year.
In January of 1987 investors essentially capitulated into the market, couldn’t take it anymore...they too needed and wanted to get rich quick.
From fall of 1982 until Oct 1987 the market had just gone ballistic and every nay sayer in the world had their comeuppance.
Like many late bull markets, investors were late to the party and went instantly to the aggressive side of things and then promptly lost money.
This downturn is probably a bit like that, as folks have tossed money carelessly into things without ever considering fundamentals.