While some fans can't be trusted to keep plots of major books, movies and television shows a secret, we know that the actors can — thanks to their professionalism and, well, the fear of breaching their NDAs. Of course, that isn't a foolproof system, and many stories have been reported in which irreplaceable franchise actors have accidentally spilled the beans and tried to cover it up. After all, the internet makes it easy for even the most obscure press junket interview to go viral.
