It was the stunt that stunned the art world and the elusive artist behind it is now out to prove it really happened. Anonymous British artist Banksy made heads spin when his "Girl With Balloon" canvas shredded in front of a crowd after it sold at auction for $1.4 million, but many speculated about whether he was telling the truth, claiming the painting didn't shred at all. Others believe the auction house was in on it. InsideEdition.com's Mara Montalbano (  / maramontalbano  ) has more. #InsideEdition