Today is patch day in EVE, with one of the major items being the conversion of one old plex into 500 new plex. All market orders for the old plex were cancelled by CCP, so as soon as the server came up, new buy and sell orders had to be created. This, of course, lead to massive price swings and speculation.
Since I was up early for a work call, I got in just as the server came up, dumped most of my liquid ISK to my Jita alt, and started buying up new plex. In about an hour my funds were fully invested, and one hour after that I was able to sell all the new plex for a quick profit of a few billion.
Good times, and thanks to CCP Falcon for the tip on the Goon forums about all of this. Good guys win again. Now to RMT that ISK through the official Mittens RMT machine.