Mine was simple: I did a middle-mouse-button paste of "init 6" into a root window of our main Solaris server that hosted about 100 users, mid-day. Boss shrugged

Mine was simple: I did a middle-mouse-button paste of "init 6" into a root window of our main Solaris server that hosted about 100 users, mid-day. Boss shrugged it off, stuff happens. But that's because it was properly configured so a reboot was smooth and didn't have any snags or affect other systems once back online. At another data center across the hall, if their main server needed to be rebooted (not accidentally!), it was 3 days of troubleshooting to get it back up. I learned that after the boss hired one of their admins - not surprisingly, a big mistake.