Before my added "Ya Think" emphasis, the title is the same as a title of an article this week over at Money,USNews.com. It's not surprising to see an article like this now, as the China situation took the Dow Jones down in a dramatic way over the course of a week or so. If you want some historical perspective, there are some dates and Dow plunges historically:
August 24, 2015: -588.47
August 21, 2015: -530.94
August 8, 2011: -634.76
Six more 600 points or larger drops since 2000.