What's the nickname for Grodziskie, the beer from Poland with unusually high carbonation level?
Grodziskie:  The beer was nicknamed "Polish Champagne" because of its high carbonation levels, and because it was valued as a high-quality beverage to be used for special occasions. Beer in Poland:  Three companies now control 80% of the Polish beer market (according to data at the end of 2014).
Polish Champagne