Today’s Daf Yomi page, Eruvin 37, finds the rabbis talking about retroactive designation, or whether or not it's OK to reason your way in retrospect. Which, if you've ever watched a sci-fi or fantasy film, is what the genre does all the time, changing the rules and the history as it goes along. Film critic Jordan Hoffman joins us to discuss this phenomenon, known as ret-conning, and whether or not its a blessing or a shande. Which very famous Star Wars plot point would've greatly upset the rabbis? Listen and find out.