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From the great folks at thinkgeek, a bumper sticker perfect for these times...

There's no doubt about it. The end of the world IS coming. We're just not entirely sure how or when. We're pretty sure there'll be a broadcast message, though, about 10 minutes before the entire system goes down if the sysadmins have their shit together. But it's best to save your work often in case they don't. They might be as surprised as we are if it all ends in a total system meltdown.

And be sure to log off. You don't want your session to remain active through the apocalypse. That would seriously suck.