The interns' last day had arrived, marking the end of their summer internship. To celebrate, colleagues organized an "intern review party," where they shared humorous anecdotes about bugs the interns tried to sneak through code review during the summer. However, a door controller delay caused Timmy's access to be revoked too late, allowing him to witness the celebration and subsequently dash out of the office in embarrassment. This incident highlighted the importance of permissions checking in distributed systems, particularly when dealing with replication delays that can break causal ordering requirements. The story illustrates the need for careful consideration of synchronization between parties in a system, as well as the difficulty of ensuring permissions checking accuracy across multiple components. To address this challenge, a system like Authzed, which uses opaque tokens (Zookies) to enforce causal ordering between mutations and permissions checks, can provide a solution to prevent such issues from occurring.