The walls treated with the paint are labeled with signs reading, "Don't pee here! We'll pee back!" [Photo/huanqiu.com]

Walls in German city 'pee back' on public urinators

A YouTube video showing a special material applied to public buildings in a night club district in the German city of Hamburg, repelling sprayed liquid back onto public urinators, has won huge applause.

Residents in the renowned nightclub district coated the walls, which were frequently urinated upon, with a new high-tech paint which repels liquid, so that when someone pees on the wall, the wall send the urine back to them.

The paint costs 500 euros ($532) to cover every 65 square feet (6 square meters).