Here is a tip for those who find a great video clip on Youtube and its clones. Sometimes the vagaries of the net result in choppy viewing or you love the clip and simply want to capture a copy in case it vanishes from the net.
Well here is an easy answer to both situation: KeepVid
You plug in the address of the clip and it creates a downloadable video file that you can save. You can then view it locally with no streaming issues and on your own time.