A friend has just shown me a clip of a programme on sky where a man is talking and moving his head slightly from side to side. One side of his face and nose is quite bright as it's lit by a window and these areas seem to lag slightly behind the rest of the picture. I'd estimate a frame or so. It gives the effect of his nose 'wobbling' like jelly! He recorded the clip by using his smart phone and pointing at the tv but the effect could be seen with the naked eye on his tv. Has anyone come across this type of thing before? It was BBC 1 on sky in standard def.