They're the red and gold sombreros which will be a familiar sight to millions of tequila-loving Britons.
Perched atop bottles of Sierra Tequila, the plastic topper is a nod to the drink's Mexican roots.
And at first, it may seem like a simple marketing ploy that is later discarded in the bin after the bottle of cactus-derived drink is finished.
But it turns out there is more to the iconic little plastic headpiece than meets the eye - with Brits being left stunned by the sombrero's 'mind-blowing' hidden handy uses.
Some people have been so gobsmacked they have even called the revelations a 'game-changer'.
Perched atop bottles of Sierra Tequila, the plastic topper is a nod to the drink's Mexican roots
But it turns out there is more to the iconic little plastic headpiece than meets the eye - with Brits being left stunned by the sombrero's 'mind-blowing' hidden handy uses
Amazingly, the tiny hat can be used as a lime squeezer.
And it even doubles as a piece to measure out the right amount of tequila for a shot.
But most impressive of all its purposes is that the rim of the hat can also be used neatly to salt glass for that classic tequila shot experience.
Twitter user @J4CKMULL shared his discovery with his 500,000 followers.
Posting a snap of the sombrero salting his shot glass, he said: 'I was today years old when I realised the sombrero on top of the bottle of tequila was so you could salt your glass.'
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<!- - ad: https://mads.dailymail.co.uk/v8/us/news/none/article/other/mpu_factbox.html?id=mpu_factbox_1 - ->AdvertisementHis post notched up almost 2,000 likes and hundreds or retweets and replies from scores of stunned tequila lovers.
Jack later added: 'Don't even lie, you know you all thought it was just a cute little sombrero for your bottle.
'Game-changer blew my mind.'
And Jack was not the only one who was stunned by the little sombrero's many uses.
Someone else said: 'EXCUSE ME!? What kind of state secret is this?!'
Another commented: 'You have changed everything,' While a third added: 'WHATTTTT NO THIS CHANGES THE ENTIRE GAME.'
One user even quipped: 'I thought it was just a cute sombrero to put on your pet rat or something
While another simply said: 'I had no idea.'
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