Coworker says "I'm going to do some clean-up on the server." Two minutes later, "Oh crap." He had wiped out /var/lib. And tell you what, the server kept working

Coworker says "I'm going to do some clean-up on the server." Two minutes later, "Oh crap." He had wiped out /var/lib. And tell you what, the server kept working. We didn't dare rebooting it though. Another fun one was coming in one morning, and cleaning up after somebody used some foul PHP provisioning scripts on a customer system and had the unfortunate idea to use a function called "archive". Turned out the function didn't so much "archive" as "delete". Henceforth deletion, especially unintended deletion, was known as "shotgun archival".