Strange app of the day: UnPlugged

I'm still scratching my head on this app, but I figured I'd post it and maybe you guys could help make sense of how an app like this would be useful. UnPlugged is a one-trick pony with the sole purpose of (drum roll please) notifying you when your Mac's power cable is unplugged. It can use Growl to notify you, or a simple alert window in case Growl isn't your cup of tea.

Now, how is this useful? To double-check: If a desktop Mac's power cable comes unplugged either from the wall or the Mac itself, it just shuts off, right? As far as I know, Apple hasn't built any whiz-bang UPS technology into their recent desktops. So that leaves iBooks and PowerBooks. Is there some kind of an environment or fairly typical situations people are getting themselves into where they wouldn't know if a power cable became unplugged, given that it attaches right on the side of the machine they're working on? Sound off, if you could, and help make sense of this peculiar little app.

UnPlugged is donationware, requires 10.3.9 or higher and is available from brik software.