Why do you spray water into the glass before you serve it? Are you watering down the beer?
Never! While we aren’t quite as draconian as the ancient Babylonians,* we never ever water down the beer we serve. We use the cold water spritz before pouring beer to ensure that you get a perfectly clean glass with nothing but beer in it. The water never stays in the glass but it does make sure that there is never any residual soap or errant lint that could affect the quality of the beer. The spritz also conditions the glass so the beer slides nicely into it. Finally, the water used is cooled to the same temperature as the beer, so the glass you get doesn’t warm the beer you drink.
*The Code of Hammurabi is the oldest set of known written laws. Dating back almost 4,000 years this Babylonian code specifically addresses the issue of watering down, short selling, or overcharging for beer. These crimes were punishable by death!