I did not fully get it the first time but when I watched it again, it all started making some sense to me. It may be difficult for those who are not devoted fans of this series to fully grasp the craziness of this episode, but once you open your eyes to the genius of the writers' intent on what they were trying to achieve here, I could not keep my eyes off the show and found myself watching it over and over again. If the writers of series simply made this an one-off episode to truly stick to the original storyline, then there would be numerous critical remarks about how the writers settled for the comfort of predictability and made the whole plot so ordinary and boring. Before shooting at the TV screen and calling it 'stupid', one may want to watch it one more time and there will be that "a-ha" moment!