You need this to drink things.  

There is a nucleation etch, also called a "fizz mark" in the bottom of this glass.

The fizz mark creates tiny textured points that act as nucleation sites, facilitating the release of dissolved carbon dioxide gas from a beverage. The result is a steady stream of bubbles and a better head on the beer. Nucleation helps to enhance the visual appeal and aroma of a carbonated beverage.