Believe it or not, the photo below hasn’t been Photoshopped:
The cheap CMOS sensor of an iPhone does not expose the whole thing at once, it scans from left to right. If you take a picture of something that moves very fast (like an airplane prop) you can get some crazy pictures out of it since each column represents a slightly different time.
This oddball-but-cool effect is reminiscent of some of the distortions you see with scanner photography (for some examples, see this page).
Maybe it’s time to pull out those camera phones and start snapping pics of oscillating or rotating objects!