You go to the Tragic Magic Hidea by [ImBack] and find a link to youtube. The video does not exist anymore, and you wonder if a trace of it is left somewhere, but there's no way to track it down because all you have is the youtube ID and a remark by [jaksplat] that says: Magic gone wrong. Ouch!
Videscriptor.com
to the rescue! It has been crawling the web for video links, saving the official description and creating a description of the video along with any associated texts, essentially saving an automatic movie script for any video.
Of course if it is only a copy of some other video, it can tell you that, and there's no need to save a whole new descriptor for this one.
See link (OK, google found "Magic gone wrong outch", so maybe that wasn't the best example)