Here's the link the video...
http://www.youtube.com/watch?feature=player_embedded&v=JQwl1tuMyV8
This was a group project undertaken with college, we were tasked with trying to make a piece of worthless art appear valuable. We did this by trying to make people believe that a piece of street art was intact worth millions. We went off the idea that a small group of people later gathers a crowd. As there were eight of us, two decided to try and "sell" the piece of art work, while one person filmed and the rest of us posed as interested bystanders.