fake... Lifted it off with photoshop! Haha
Dude, not fake.
(Didn't have time to explain this yesterday...)
I was using my iPhone Original with the $2 Pic Quikr application (it lets you easily batch upload iPhone pictures to the Flickr site).
In PicQuikr, I was batch uploading some ordinary iPhone taken pictures out of the camera roll. I selected the picture of my dog on the green couch (definately without the superimposed battery image). PicQuikr uses and links to the iPhone Camera Roll 'app' functions (like picture selection, etc).
PicQuikr lets you zoom in, pan, etc the picture before it's sent up to Flickr. I was doing that with pinch and finger-slides and all of a sudden the superimposed battery image came up overtop of dog on the couch picture.
I thought it was weird, so I remembered that you can hold the home button and the power button down for a split-second and iPhone's firmware will take a screenshot of whatever's on your iPhone screen. I did that, and what you see is the resulting image, a png file actually.
I'll try to recreate it and post the steps on this if I can this weekend...
edit - RECREATE UPDATE:
Looking at the picture, I think I was in the 'Your Photo Stream' section of the Pic Quikr app...trying to recreate...
PS: Trust me, I don't need MacRumors "fame". I just thought this was weird and wanted to pass it on. As one of the Original iPhone people I paid my $600 for it back in the day, and have watched this thing grow into the best smartphone on the market today, it's been really amazing. This type of weirdness is fun to share. Do a forum search on 'yagrax' and you'll see my postings.