Well here's a cunning innovation.
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Welcome to St Pauli, Hamburg's party quarter.
Around 20 million people visit this area a year, and that creates an obvious problem.
Which isn't great for the locals.
So now the area's "peeing back".
Yup. They've covered some of the walls with a super-hydrophobic coating.
And good luck to anyone who wants to relieve themselves against a water-resistant wall.
And as Julia Staron, a spokesperson for the project says: not every wall has a warning sign, so consider yourself warned, street pissers.
