Art is an interesting thing: sometimes you get it and sometimes it goes way beyond your thinking. That's what led student Ruairi Gray to test whether he could get away with making people believe that a piece of fruit was art.

So he walked into the Robert Gordon University in Scotland and left a pineapple at the Look Again exhibition. To his amazement, he came back a few days later and saw the pineapple had been encased in a glass box.

The 22-year-old told the Daily Mail: "It's the funniest thing that has happened all year. My honours supervisor saw it and asked an art lecturer if it was real because he could not believe it."

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After one of his mates, Lloyd Jack, uploaded the picture to Twitter, and the Look Again exhibition tweeted him saying: "We loved your addition to Pester and Rossi's Inflato Optical Image Intensifier."

But it the art administrators have been trying to find out who was the one who put the glass box over the pineapple.

Cultural assistant for the festival who organised the display, Natalie Kerr, has told the Press and Journal she definitely didn't, because she's allergic to the fruit. She says: "We were moving the exhibition, and came back after 10 minutes and it was in this glass case. It's a bit of a mystery - the glass is pretty heavy, and would need two or three people to move it, we've got no idea who did it.

"But it's still there now, we decided to keep it because it's keeping with the playful spirit of this commission."

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The prank is very similar to when a jokester placed a pair of glasses on the floor of the San Francisco Museum of Modern Art. Kevin Nguyen, 16, and TJ Khayatan, 17, wanted to see how far they could push the limits of 'what is art' and came away with a pretty decent result.

LMAO WE PUT GLASSES ON THE FLOOR AT AN ART GALLERY AND... pic.twitter.com/7TYoHPtjP8

- TJ (@cuttyboy_tj) May 24, 2016

Nguyen told the Guardian: "We thought it would only get maybe at most a couple hundred retweets, but hey, I have a pair of famous glasses on my face every day now"

It reminds me of a video, which I can't work out if it's real or a prank. But a man went to the Smithsonian Museum in Washington DC and mistook garbage for an art exhibition. Check it out here:

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Even when one of the attendants tells him that it's just trash and the exhibition closed down two days ago, the man says: "I thought it was a good commentary on the disposable American society."

But trash can sometimes be art.

A group of Italian cleaners found that out the hard way when they accidentally cleared away an exhibition at the Museion Bozen-Bolzano in the northern Alto Adige region.

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the artwork by #goldiechiari removed by cleaning staff has now been fully reinstalled. https://t.co/HSypzoAKaL pic.twitter.com/joIgKW5iMM

- Museion (@MuseionBZ) October 27, 2015

The artwork was a bunch of champagne bottles and party supplies on a table, titled Where Shall We Go Dancing Tonight? According to the New York Post, it was supposed to be a comment on the rabid consumerism of the 1980s. But cleaners came in thinking it was just the mess of a rowdy after-party and cleaned it all away.