WATCH: Painting of girl with balloon sells for $1.4M. Moments later, the unthinkable happens.

The unthinkable happened during an art auction in London on Friday. Just moments after a painting sold for more than $1.4 million, it self-destructed — literally.

What happened?

As the final gavel fell at Sotheby's auction house in London, an iconic painting known as "Girl with Balloon" partially passed through a shredder hidden inside the painting's frame.

The painting was the work of renowned anonymous street-artist Banksy. The artist confirmed the stunt through his official Instagram account, writing: "Going, going, gone..." The artist later posted a video showing him prepare the frame several years ago.

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. "The urge to destroy is also a creative urge" - Picasso

A post shared by Banksy (@banksy) on Oct 6, 2018 at 10:09am PDT

"The urge to destroy is also a creative urge," Bansky wrote, quoting the great artist Pablo Picasso.

Alex Branczik, senior director of the auction house's contemporary art, said in a press release: "It appears we just got Banksy-ed."

However, as CNN noted, it's not clear how a mechanism inside the frame triggered the painting's self-destruction at the moment it was sold.

The painting's auction tied the record for most money earned for a piece of Banksy's work. A piece of his art previously sold for $1.4 million in 2008.