Residents of Hamburg's red-light and nightclub district St. Pauli will get a shock if they decide to spend a penny in public.
New urine-repellent paint is being used as a method of tackling nuisance street-weeing revelers, meaning anyone who attempts to urinate on a building will have the liquid fired right back at them.
"This paint job sends a direct message back to perpetrators that their wild urinating on this wall is not welcome," Julia Staron, who organised the campaign, told Reuters.
"The paint protects the buildings and the residents and most importantly it sends a signal this behaviour is not on."
In a YouTube video, Staron is seen putting up a sign saying “Hier nicht pinkeln! Wir pinkeln zurueck” (Do not pee here! We pee back!).
Staron plans to raise funds for more paint, which costs 500 euros to cover six square metres.
"When you go out on the street here, you think you've landed in the sewer," she told Der Spiegel.