German city uses hydrophobic paint to splash public urinators with pee..

You piss on the wall, and it pisses on you right back.

What do you do when you're sick of drunk people urinating on the walls of your city, stinking the place up? Well, if you're as savvy as the community of St Pauli, the red light district in the Germany city of Hamburg, you turn to science.

The district, which is one of the main party areas in the city, has now sprayed its most-frequented walls in hydrophobic paint, which is so repellant to liquid that it rolls, or sometimes bounces, right off the surface. This means that now when someone pees on one of these walls, the wall pees back.