Many years ago, I was working for a largish optics company.
One morning, I walked through the accounts department to find it a ghost town. The department was missing - just the Finance Director was still there. They'd had a fileserver failure, and the support guy couldn't make it in until Monday, at which point it was a wipe-and-restore job, probably taking several days. As this was Wednesday, that was looking like a week of not working, and the FD was about to melt into his own despair.
It was a NetWare system, and I'd done some support for that about five years previously. I offered to take a quick look. He seemed convinced that, as long as I didn't actually set fire to the building, there was nothing I could do to make anything worse...
It took me 10 minutes to diagnose the problem. It took me 20 minutes to summon up the courage to do what I thought needed to be done. And then the fileserver was backup, with everything running.
I came into work the next day to be told that the FD was looking for me. Worried that I had screwed up, I went to see him with some trepidation. To be met by a large grin and a larger bagful of beer...
Vic.