A screenshot or printscreen. I did it once accidently , so it should be possible.
Screen shots on the Galaxy Nexus: Press power and volume down at the same time.
Screen shots on the S3: Press power and home button (physical button) at the same time.
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The trick to it is to hold the side of your hand on the screen then swipe across. It took me a while to get it right. I take accidental screen shots a lot with this phone.
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A screenshot can be used to show a developer comrade an error message, prove a high score on Angry Birds, or show us nerds how awesome your array of homescreens is (like the OP of almost every custom ROM thread). "Whoa dude, where do I get that theme?!"