We learned the hard way yesterday that you can't do a whole lot of work in the modern office without a working computer network.
It didn't last long (happens to everybody at some point) but it still sparked a flurry of making backup plans, waiting for updates and other behavior akin to hunkering down during a natural disaster.
And me? I dug out that big, yellow book that's more dust-bunny habitat than directory nowadays. People still make phone books, ya know?
Of course, beyond calling a bunch of people and taking notes, I couldn't have done a whole heck of a lot. What does your office usually do when the computer network, or power for that matter, goes down?
We have cell cards for our laptops and VPN access. So, worst comes to worst, we can work from home :)