dow plunges on suspected typing error

It could easily happen that you type billion instead of million but think about the potential to profit in that scenario. Forgive me for always being the cynic when money is to be made.
The market plunges 9% and you and your mates have shorted the DOW with a sell after 7%. Instant millionaire (or should that be spelt billionaire?). Perhaps you ha your sell in at 2% because you had no idea the reaction would be so pronounced. Automatic trading does that. Let's hope you had your sell in at 10% and it wasn't reached so you lost all.
Anyway, to me it is an indication of how easily it is for people in the know to take advantage of the average punter.