Banksy is a well known artist who's unknown. You may be saying to yourself, WHAT?! He's kept himself anonymous for years and his art reflects anti consumerism and dark humor. And no one knows who he, or she, is. Sotheby's sold one of his paintings at auction recently for just over $800 thousand dollars. Moments after the gavel dropped, the painting shredded itself with a built-in remote controlled shredder. The stunt may have backfired on Banksy though, experts are saying the strips of the work alone could be worth five times what it sold for.