Tip: Always placing a cocktail napkin underneath the beverage sends a message that you are a professional and organized Bartender.
If you have heavy humidity and are having trouble with the napkins sticking to the bottom of customers’ glasses, throw one shake of salt on the top of the napkin. Now the beverage napkin won’t stick to the glass.
*Don’t go overboard though because your bar top will look like a shuffleboard table.