Check out these cell-phone-camera shots of airplane propellers, victim to an effect known as "rolling shutter."
http://www.core77.com/blog/object_culture/your_cell_phone_cameras_unintended_rolling_shutter_effect_17253.asp
Seems those propellers have some issues :-)
interesting piece of info. had seen that phenomenon before.
Here is also one I noticed on Wikipedia when I was looking for something else, I think it shows less of an effect, but it looks a lot more realistic so you get a better idea of how it works:
http://upload.wikimedia.org/wikipedia/commons/4/46/Focalplane_shutter_distortions.jpg
It was used on:
http://en.wikipedia.org/wiki/Focal-plane_shutter