Why do we, as viewers, like to be spoiled? It was never like this in the 60s or the 70s or the 80s or even most of the 90s. We never found out who shot JR before Dallas aired or what was going to happen on the next Seinfeld. THR.com sat down with the showrunners of several popular shows, including Matthew Weiner (Mad Men), Shonda Rhimes (Grey's Anatomy), Greg Daniels (The Office), Katie Jacobs (House), Alan Ball (True Blood), and Jenji Kohan (Weeds), and they talked about this and many other things. (Full interviews here.)