Posting a picture of the moment on Instagram, Banksy wrote: "Going, going, gone..."
The article doesnt make clear whether the "sale" went through, since it only self destructed after the auction was over.
Now a better idea would have been to put in a delay of say a few days, wait until the buyer got it home ........



https://www.bbc.co.uk/news/uk-england-bristol-45770028