Hardcore Irn Bru fans are threatening to "storm" the Scottish factory where it's made to find the original "full fat" recipe.
A social media campaign has been launched by lovers of the soft drink, fed up with the new version which has less sugar.
More than 2,000 people have joined the online call to raid the AG Barr factory, steal the original recipe and any stores of old Irn Bru cans and bottles.
The campaign states: "We want full fat back, what they gonna do, phone the polis."
So far 748 people have responded to the Facebook event, set to take place on November 15, to say they are going, with nearly 2,000 more saying they are interested.
But it looks like they might be left a little disapointed, reports the Daily Record .
A spokesperson for Irn-Bru says: "We're always up for online banter but seriously, any potential stormers will be disappointed; there's not been original recipe BRU on site for well over a year."
Last year AG Barr, based in Cumbernauld , North Lanarkshire, changed the recipe of their popular product to comply with the UK Government's sugar-tax.
Sugar content slashed by half
Irn-Bru's sugar content was slashed by half, from around 10g per 100ml to just below 5g.
The move attracted widespread dismay among fans of the orange-coloured fizzy drink, with a petition titled "Hands off our Irn Bru" set up in response.
It attracted more than 6,000 signatures.
As the new recipe was introduced, some sweet-toothed drinkers even started stockpiling the fizzy drink.
The page is reminiscent of the "Storm Area 51, They Can't Stop All of Us" American Facebook event, which encouraged people to invade the secretive, no-go US Air Force base in Nevada, in search of alien life.
Posting on the event page, one cheeky attendee uploaded a picture of a topless man in a kilt saying: "Photo of the front line troops."
Others commented: "This event should be retitled 'Storm Area Fizzy Wan'" and "I'll be outside with a stall selling irn bru if anyone wants any. 2 fur a £1."
Someone else added: "I miss the original recipe! Why not give us the choice and charge a bit extra? I'd pay."
