Partying in Hamburg, Germany? Stuck for a toilet? Well, think twice before using the streets as a public urinal… because the residents of St Pauli, in the party quarter of the German city, have come up with a novel idea to stop you from peeing publicly in their neighborhood. They've covered various walls in superhydrophobic coatings, which, hilariously, cause urine to splash back on urinators. Some of the walls have warning signs, but others don't, so your best bet if caught short in St Pauli, is definitely to find a proper toilet! Check it out! It's pee-back time!