Which is much better than having an appallingly scrambled memory, as I only recall there ever being a major crash back in July/June 2011, and of course now April 2013. There was certainly no crash throughout 2012, as I waited through most of the latter part of it for a correction that I felt would come, but never did.
You need only go back and look at Mt.Gox history to see the bubble an crash in Nov 2010, it something like 10 cents up to 50 then back down to 20, it also ran for a shorter timer period, just a week from start to finish. In absolute terms a small thing but proportionally its was as large as the other more recent bubbles.
I have never been a Bitcoin investor but I have been a Bitcoin buyer and spender right throughout the period that you state and cant remember anything like what you state, which pretty much means it was just a glitch in the system as opposed to being triggered by either mass buying or mass selling. Bitcoin only really costs 50c or $500, if enough sellers or buyers are accepting those prices. I could go on an exchange with a handful of Bitcoins. I could put in an offer for 50c, and put in a ask for 50c. Therefore, for a brief moment, Bitcoins would be worth 50c. I could do the same in the other direction as well.