I went to Germany a few years ago, and after hours on the train, really had to pee.
When I got there, they all said, just pee on the wall, everyone else does.
The city of Hamburg has erected signs around the city reading “Don’t pee here. We pee back.” A public awareness campaign video shows CCTV footage of a stream of men on the way home from a drunken night out stopping to relieve themselves in the street. Then the video introduces the city’s secret weapon.
The association told a number of outlets that when liquid hits the walls it rebounds with “almost the same force”. Handy graphics spell it out for anyone still confused.