A Danish brewery has made a new beer using barley fertilised with 50,000 litres of urine from a music festival.
Norrebro Bryghus says the final product won't contain any human waste.
Pisner (you can see what they're doing there) will be produced from fields of malting barley fertilised with human urine rather than traditional animal manure or factory-made plant nutrients.
The waste was collected from Roskilde, northern Europe's largest music festival, two years ago.
"When the news that we had started brewing the Pisner came out, a lot of people thought we were filtering the urine to put it directly in the beer and we had a good laugh about that," said Henrik Vang, chief executive of Norrebro Bryghus.
Using human waste as a fertiliser on such a scale is a novelty, said Denmark's Agriculture and Food Council.
It came up with the idea for what could be the ultimate sustainable hipster beer.
It's already called the concept "beercycling".
"If it had tasted even a bit like urine, I would put it down, but you don't even notice," said Anders Sjögren, who attended Roskilde Music Festival in 2015.
The 50,000 litres collected from that festival resulted in enough malting barley to brew around 60,000 bottles of the beer.
A machine that turns urine into beer actually exists.
The contraption, developed by a team of scientists at a Belgian university, turns human waste into drinkable water and fertilizer using solar energy.
Water recovered from a 10-day music and theatre festival in Ghent last year was then used to make beer.
"We call it from sewer to brewer," said University of Ghent researcher Sebastiaan Derese.