The thing about human nature is, if someone tells us we can't do something, we have to try and prove them wrong. So, when the Royal Mint brought out new £1 coins, which were 'near impossible' to fake, it was just throwing down the gauntlet to forgers across the country, wasn't it?
Just weeks after being released a man already reckons he's already found a fake quid.
Roy Wright, from Surrey, said he was shocked once he spotted the subtle differences and now worries there could be more counterfeits out there.
Roy said his partner was given the coin from their local Co-Op after buying some lottery tickets.
Roy said: "She came home and put the ticket and change on the bed. Later we ordered a kebab which cost £16 and had it delivered.
Roy's quid is on the left. Credit: SWNS
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"I always give a tip so I went to pick up the change from the bedside table.
"I have a bedside lamp which casts a different shade to the main light and as the coin passed underneath it in my hands one of the coins looked a different.
"I started looking at it more closely and paid the delivery man with another pound coin I had on me.
"I then compared it against three of the normal pound coins and realised it was completely different. It has a different thickness and is a different colour."
The new 12-sided coin came into circulation last month, with the Royal Mint hailing it as the 'world's most secure coin'.
"The coin is completely different and is more rounded around the edge," Roy added.
"There is clearly space between the engraving lines, it's a different size, the Queen's head is to the left, and there is no detail of the head of the thistle - it's just a blob.
Roy's on the left, again. Credit: SWNS
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"The stem of the coin has got no detail on it, there are a lot of things wrong with it."
The new one pound coins should feature a hologram-like image at the bottom, which changes from a '£' symbol to a '1' depending on how your hold it. It also has micro-lettering and a 'high security feature' built-in. Fancy.
Before the coins became legal tender, hundreds of 'trial' coins were given to shops to help upgrade coin-handling machines and equipment. Although these can't be used in shops, they are selling for a fair whack on eBay.
The Royal Mint has yet to comment on Roy's coin.
Featured Image Credit: SWNS