Banksy Picture Shreds Itself After Auction

Via a friend who asks: "Is the picture worth more or less than when the hammer came down?"
From the BBC, October 6:

Banksy has released a video showing how he secretly built a shredder into one of his paintings that self-destructed after it was sold for more than £1m.

The framed Girl With Balloon, one of the artist's best known works, was auctioned by Sotheby's in London.

Moments after the piece was sold, the canvas of a girl reaching for a heart-shaped balloon shredded itself.

Quoting Picasso on his Instagram, Banksy wrote: "The urge to destroy is also a creative urge - Picasso."...MORE including the Instagram version of the video.

Here it is on YouTube: