In October 2005, you could have bought an option to buy google stock at $320 for $170. The next day, the option was selling for $1,990 (more than ten times the price the previous day) if you had bought an option to sell the stock at $320 instead of to buy, the option would have cost $1,830. The next day it was worth $5. Why did the price of theses options changes so dramatically and opposite directions?