Heh, I was trading the grains while his blowup happened. Crazy moves, like 10% up in 20 minutes, then back to unchanged later. 100 cent moves in an hour.
From what I remember, he was a broker at MF, and had a terminal that didn't have position limits built in to the software, or found a way to bypass this. So he just piked on increasing size, following the typical noob martingale strategy to recoup initial losses, unfortunately he did it in the face of a historic bull market of epic proportions, and then put in the top by blowing up.
Pretty expensive IT/risk-control oversight. The guy was just some low-wage piker broker who never really produced for them. Amazing that even the big names in this industry are such clueless noobs.