Password-protected posts contain heavy spoilers and are there to prevent accidental spoiling. They can each individually be accessed with the password "SPOILME(#of the post)". That means if the post is numbered #0000, the password is SPOILME0000 - SPOILME all in caps, no space in between.
Enter at your own risk. And have fun!
Protected: Notes & Reactions #0005 | Exhalation by Ted Chiang