Thursdays -5.9% $SPX fall. 

Guess how many days SPX fell more in the last 20 years?

7 times. 

6 in 2008 - all during the 75 days after Lehman Collapsed. 

1 in 2011 - After US credit rating downgraded. 

That's it.

You still think -5.9% draw is no big deal?