Jewish Festivals: Ending: Havdala: Filling the Cup

You must pour at least 4 fl. oz. (119 ml--a revi'it) of wine or other beverage into the havdala cup--this is halacha.  However, to symbolize that we are blessed (siman bracha) with wealth, overfill the cup (non-binding custom).
Note Do not drink the overflow, to show that we are so rich that we do not need the spilled beverage.
Note Do not overfill a cup containing shmita wine!