Network admins sometimes say "it's better to put your eggs in one basket, as long as you use a really good basket." Which is all well and good, until the network admin in question gets mixed up and turns that central/critical server off on purpose. During business hours. Because he thought it was a non-production server. Did I mention this particular server takes 20 minutes to reboot?

Oh stop it. Damned things look identical from the console and you know it. The stupid Exchange system takes forever to shut down and boot up. Not my fault!

Well, except for the "accidentally shutting it off on purpose" bit, I guess.