I think it was purely a graphing error in the script that draws the line. That or a database error from MTGox. Either way, people said they had sell orders in at like $9 that didn't go through so that means the price did NOT get to like $15 or whatever. It simply never happened, the graph on live just said it did.
By the way, it's at like $5.93 right now, mister "it's more than $6" lol. Oh and btw, it's worth mentioning that you can make money no matter what the price is if you can predict what's going to happen and you don't care what currency you make it in. When it went up I sold 5 BTC for $26 even ($5.20 ea) and then bought 5.4 BTC when it dropped back down to $4.83. Thus I made 0.4 BTC. Coincidentally I also made precisely 0.4 BTC by rally betting at that btc flip site
so whatever investment method you prefer lol.