Saw this online...crazy what the iPhone lens can pick up....
Kyle Jones wanted to see what it was like to film from inside a guitar, so he stuck his iPhone inside and started recording. The resulting footage shows the strings vibrating in wacky wave patterns thanks to the rolling shutter effect.
Tips:
? You must have the strings brightly backlit to get the camera to capture at such a high frame rate (pure conjecture). You can see how the effect fades when the buildings come into view.
? Use a pencil
*This was used with the front facing camera, try the back camera, it may capture better! (tried it, it didn't look as good for me)
[ame=http://www.youtube.com/watch?v=TKF6nFzpHBU]Guitar Oscillations Captured with iPhone 4 - YouTube[/ame]