Well this is not a one day thing, first look at 2015 headlines,
2015 Was The Worst Year For The Stock Market Since 2008
Then you have the Chinese stock market in Aug 25, 2015 so this is the second time!
Then you have today where the Chinese stock market loses 7% and the Dow goes down 276 today, look at the headlines,
Dow Sees Worst First Day of the Year Since 2008
So 2015 was the worst since 2008 and then the first day of 2016 is also the worst since 2008. I say that is not a one day event.