From Mark, elsewhere: "I had a wild-ass limit order [on CELG] placed at $87 on the off chance a day like Monday presented itself. It actually went down to $86. Very, very surprised that it filled."
Good going, Mark!  And that being the case, I wonder if anyone here, including Mark, has any similar orders in place right now.  How about it?
Yesterday, at Fidelity, I investigated the idea of placing a few conditional buy orders (instead of limit orders) with a flash crash in mind, based on % decline.  The only semi-workable condition I could come up with is: execute order if during any single day, the stock/etf/etc declines by a buyer-set %.  I saw that PJP, a pharmaceutical etf, had a single-day flash crash last week of around 45%.  Not that I really expect lightning to strike twice, but I put in an order to buy a few shares if the stock drops 35% on any given day.  Did it more as an experiment as anything else, just to see.
            
                      
      
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Edited to add - who say's there no such thing as luck.