EEVBlog #1131 - £1M Prank - Banksy Artwork Shredded! HOW?

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A look at how the Banksy artwork prank "Girl with a Balloon" shredded itself moments after being sold for £1M at a Sotheby's auction.
How long did it sit idle waiting to be triggered?, and was this actually possible?
NOTE: The Artwork was authenticated by "Pest Control", which is Banksy's own authentication house. If the artwork was delivered to them for checking before the auction, this is when they installed the mechanism. I still think the at least the seller has to be in on it, and likely the buyer (otherwise they could sue Banksy and bring his real name into the public). And if Sotheby's were in on it (they'd lose their reputation if they were) they look like fools. Lose--lose for Sotheby's.
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