Consider that Blackest of Mondays during 1987, the market started out similar to this, with two prior days almost identical. During the day, the futures were down, hold on to your ass, 30%. Today, that would be 590 SPX. Locked Limit would make that impossible today. But -150 is not out of the question.
Agreed...and there weren't many "Black Monday" threads...of course when the market is just in your run of the mill correction, everyone thinks it will crash...
Instead everyone is still dip buying in front of this freight train.