This server is ultra reliable - Sun hardware, Solaris OS (unix flavour). Its not had a error (ones not caused by human intervention that is) for two years or so (and that was due to a rapid series of powercuts). We ran the sessions as best we could as I couldn't spot the error. When I finally tracked it down I found a bad 'superblock'. One reboot into 'single user' mode and an 'fsck' and the server bursts back into life. Part of the forum files were corrupted but a rapid install then reinstatement of the database and everything is rosy again.
It works perfectly for months, the one day it decides to break is the one day I really need it to work.
I wonder whats awaiting me tomorrow - maybe the room will fall down around me, maybe something else. No doubt that I'll find out tomorrow.
Whoever is pulling these strings is really having a laugh. When I find out who, there're going to find themselves on the business end of a large amount of electrical energy - or worse.