In order to document / educate / show off how quiet the Prius is, I mounted a camera with a GPS mount to create this video. I was able to capture the quietness, smoothness as well as the hybrid feel pretty much. What I noticed while watching it back is the engine shutdown noise. I was amazed because the camera did not shake as the ICE shutdown nor comes on. I heard some clank sound before and after the ICE shutdown which don't sound normal to me. It could be from some other external source. What do you think?