We don’t want to alarm you, but the next time you down a cold, frosty beer at a music festival, you may or may not be drinking someone’s pee. But don’t worry, it’s all for the environment, so it’s totally cool and you shouldn’t freak out or throw up.

As The Guardian reports, Denmark’s recent Roskilde festival trialled the latest advancement in beer brewing. The collected urine of 100,000 festivalgoers was collected in specially designed storage tanks, which will be transported to nearby fields to fertilise malting barley for brewing beer.

The new initiative is called “From piss to pilsner”, naturally, and the organisers of northern Europe’s largest music festival, which recently went down in Zealand, Denmark, were hoping to collect 25,000 litres of urine from more than 100,000 festivalgoers.

Presuming everything goes according to plan and the tankers transporting the precious piss aren’t hijacked in some sort of Fast & Furious-style heist, guests at Roskilde 2017 will be served beer from barley fertilised by the urine of punters past.

“It’s about changing our approach to waste, from being a burden to being a valuable resource,” Leif Nielsen from the Danish Agriculture & Food Council (DAFC), which is partnering with festival organisers to promote “beer cycling”, told The Guardian.

“The huge amount of urine produced at festivals was having a negative impact on the environment and the sewage system,” said Nielsen. “But beercycling will turn the urine into a resource.”

Nielsen is confident “From piss to pilsner” will be a success. “I think most people can see the reason and the fun behind making a personal contribution to beer brewing, and the fact that rock music is involved will help us get our message across.”

What’s more, some lucky punters at next year’s festival will be gulping down superstar urine. According to The Guardian, organisers were hoping some of this year’s headlining acts, which includes Florence and the Machine, Pharrell Williams, and Paul McCartney, would make contributions.

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“We’ve got urinals right next to the stages where the acts will play, so we’re hoping to collect some rock star pee as well,” said Marie Grabow Westergaard from the DAFC. “Female performers and festivalgoers are being encouraged to join in with free cardboard ‘urine directors’ that we’re handing out next to the urinals.”

What’s more, revellers seem to be pretty chuffed with the initiative. This year’s festival saw queues of punters lining up behind a vast hoarding that read, “Don’t waste your piss. Farmers can turn it into beer again”.

“I think it’s a really cool idea,” said reveller Lasse Riisberg, 26. “It’s something that would just go to waste normally but this way, you can do your bit for the environment and have fun at the same time – you drink then you piss, simple!”

“It’s funny and it encourages you to use the urinals rather than just going in the grass or wherever you are. Roskilde festival has a reputation for being pretty green and clean but this is a whole other level,” added Rasmus Skobbo, 25.

“Everyone wants to be more environmentally friendly these days,” said Skobbo. “So this is a great way to feel like you’re doing something good for the planet – without much effort. We all have to piss, right?” We do indeed, Skobbo. We do, indeed.