On Oct. 19, 1987 -- Black Monday -- the stock market tanked. The Dow Jones Industrial Average fell over 500 points -- a 22% decline.

But more than 30 years removed from the epic crash its hard for some, especially younger folks, to understand the severity of that day and the risks associated with major stock market crashes (other than the evaporation of wealth).

The crash was triggered for a few reasons. But one of them was legislation from Congress that would limit the tax savings that companies would receive after merging. So companies would have less of an incentive to merge.

The legislation was unveiled the week before Black Monday, causing the stock market to drop. Regulation tends to make investors nervous.

But on Monday, the selling kicked into high gear thanks to computer trading, which would automatically push investors into cash positions and sell their stock holdings anytime the market declined.

Imagine what happens when almost everyone is employing this strategy? Pure mayhem!

Now that you've had your #FlashBlackFriday, figure out how to navigate today's markets via our Trading Strategies roundtable.