Haha! "Uncrop" amazing! I should really watch Red Dwarf.
In a photograph pasted into a Word document and then cropped within it, you often can uncrop, because the crop is non-destructive.
Heh - good point! And then there's the "redacted" bits in government PDF that turned out to be nothing more than "Kennedy assassination carried out as requested by Agent F. Castro" followed by "rectangle(colour = black, position = last 9 characters of line)". All you need to do is edit the PDF and you get all the documents you could want. I love it when faith in technology fails in informative ways...
Did you watch the video? He uncropped a picture which had been printed as a cropped photo.
Not trying to legitimize what is obviously satire, but you could possibly uncrop a printed photo, if the original photo was online, and if it was indexed by Google. Reverse image search win.