On Thursday, the Dow Jones Industrial Average tumbled about 800 points. As of Friday morning, the Dow Jones Industrial Average futures were also tumbling.
What the hell is going on?

Opinion
The S&P 500 fell 1.7% on Thursday. The Dow dropped 1.7%.
On Thursday, the Dow Jones Industrial Average tumbled about 800 points. As of Friday morning, the Dow Jones Industrial Average futures were also tumbling.
What the hell is going on?