Trinkhallen (drinking halls) are ubiquitous in Germany.
One of the ones close to the Hauptbahnhof in Mainz definitely leaves its mark, though.
Patrons flip off their bottle caps onto the road where they’re promptly – weather-dependent, of course – integrated into the road surface by a combination of pressure and heat.
Sounds a bit like metamorphic geology to me.
A new research project for Professor Dr Heliospheric, perhaps…?