I had two RedHat AS 4.6 servers that were unable to boot due to a heinous act of boot-prevention committed by one of my co-workers. (Details not for you; what happens in $COMPANY stays in $COMPANY).
I needed to be able to mount the root filesystem read/write to fix it. So, I logged on the DHCP server, and set these boxes up to boot from our current netboot rescue image, which is maintained by another team. It was invalid; files had been removed, and I didn't have time to set it back up.
So I went back in and reconfigured it for our old, deprecated-but-still-supposedly-valid netboot rescue image. No dice; files have been removed, and CBA to set it back up.
So I went into my stack of CDs to get my AS 4.6 boot CD. Gone.
Went to the other team's cabinet, to get their AS 4.6 boot CD. Gone.
I happen to have this image on my hard drive. Borrowed a blank CD-R, went to burn it. Windows laptop is messed up, can no longer burn CDs; three lockups and forced reboots later, I give up.
Walk into the machine room, hook up the KVM tray, insert my trusty Ubuntu 9.04 USB key (4GB Corsair FlashVoyager GT, highly recommended) and fix the servers, no muss no fuss.
Shoulda just used Ubuntu from the start. What I get for following corporate standards and documented procedures.
Now to go find the person responsible for those rescue image documents, and make an example of him for the next ten generations of system administrator. Anybody got a pike you aren't using?