For me it was a needed reboot that killed it. I had been installing and configuring the system. Only mildly annoyed by the changes, and trying hard to keep an open mind. When I found that a change I had made didn't really seem to be taking effect. So I thought reboot.
Where the hell is the reboot?
Can anyone find the reboot command?
How about a shutdown command?
What the hell have they done? I can't shutdown or Reboot?
Google to the rescue.
Sorry, but if I have to google to figure out how to shut a system down the system is broken beyond repair.
The machine was for multiple remote users testing on a number of VMs. I could just imagine the hell that awaite me trying to teach endusers to log out cleanly. I ended up putting a logout script on the desktop of every user, and telling them that they would horribly break the system if they didn't use it EVERY SINGLE TIME!!!