What I know about art can be written on the back of a postage stamp, but from what I have seen it does appear to be a fickle business.

The Mona Lisa, Sunflowers, the one with the weird face screaming – all really great stuff – I just can’t grasp why an unmade bed, a urinal and a Sainsbury’s receipt (I walked out of Tate Modern when I saw one hanging in there) are held – at least by some pretentious gits – in such high regard.

What I will say, however, is that from what I’ve seen of this Banksy person, I’ve enjoyed.

He – or she, nobody knows – hit the news last week for a devilishly crafty stunt which saw a really famous painting called ‘Girl With Balloon’ shredded into neat little strips immediately after selling for £1m at auction.

While I’m pretty sure it was meant to have been done as a one off, it turns out that other daft art owners have been replicating the feat in order to add value to their paintings.

According to the art experts at MyArtBroker.com, an owner of a similar Banksy print thought to be worth over £40,000 has only gone and sliced it up with a stanley knife. But get this: he now wants a minimum of £80,000 for it.

Sold! To the biggest idiot in the room…

Despite the print being one of just 600 mint condition versions in the world, the owner somehow thought its value would double by copying the stunt and essentially destroying it.

The real experts have labelled the act as ‘crazy’ and ‘opportunistic vandalism’ and reckon it’s only worth a £1 now.

Expensive mistake.

Ian Syer, co-Founder of My Art Broker told MailOnline:

“What this person today seems to have done is needlessly ruin a print worth around £40,000 and reduce its value to almost nothing.

“We strongly recommend nobody else takes valuable art and tries to cash in on what history will judge a simply brilliant stunt.

“There are limited numbers of Girl With Balloon prints in the world, today, we lost one and it’s a crying shame.”

Banksy shocked the world when he pulled off the unexpected last Friday.

Apparently he’d always had it in the pipeline, though; a video was released showing how a shredder had been placed in the frame years ago in case it ever sold at auction.

Could we start a petition to get that Sainsbury’s receipt in Tate Modern shredded next?

That thing still infuriates me.

Images via My Art Broker