I hate to find myself in similarity with a quasi-bear troll corporate shill, but yeah, I was caught off guard by this too. 

I did a Localbitcoin's buy of nearly 5 bitcoins, and then I was going to sell back right away with nearly a $30 spread - however, I had another urgent matter in the real world that I needed to deal with, so I thought that I should take care of the real world matter first, and prices have been pretty stable for a couple of weeks.. so no big deal, and then I would sell the coins that I had bought after I finished up the real world matter.  Next thing you know, I turn my head, and my $30 spread turned into a $15 spread... and therefore, I just locked in the $15 spread.. and a bit irritated by my having had diddle daddled around in my distraction. 

I hate selling like that when the price is going down in a sudden manner, especially when I should have just locked in the deal.