In the Middle Ages, there was the profession of urine collector in Flanders’ Ghent (now Belgium). From the urine, ammonia was then extracted, which went to make a cellulite for powder. In the morning, the collectors drove around the city with a barrel and paid for urine. Of course, there were cunning citizens who began to dilute the product. Then a new profession appeared - a tasting urine, which organoleptically determined the quality and concentration of precious ammonia. But the New Times came, people learned to synthesize ammonia or extract it in other ways, and the profession of a urine tasting became unnecessary. And all these urine specialists left Flanders, moved to Amsterdam and founded the Heineken brewery.