Check out this utterly awesome picture taken of a Yak aerobatic trainer taken with a iPhone:
Airplane Prop + CMOS Rolling Shutter = WTF on Flickr – Photo Sharing!.
The combination of the slow scan speed of the camera and the movement of the prop has done something fascinating to the image. In the old days, some cameras had moving slits for shutters and they did similar effects to propellors, but usually the props just looked a little bent, rather than discombobulated.