Pillows: great for sleeping, hitting people with, and building forts. Basically, the three fundamental impulses of society. You're part of society, aren't you? You've got a computer, so I'm assuming you're not some wastelands vagabond survivalist (but if you are, kudos; that's gotta sound awesome on a resume). You probably need pillows.
They go on beds, couches, airplanes, cars, hammocks... or the street, if you're a little down on your luck. Doesn't matter where they are, they're your ticket to Dreamland, where hopefully your life sucks a little less. But even if it doesn't, at least you'll wake up well rested. All thanks to pillows.