I really think the title explains it all: those people who keep clicking the filler thing with their cup and letting the fizz settle and then clicking it again and letting the fizz settle until not one more drop of soda can be placed into the cup under normal atmospheric pressure.  Is that last 0.5 ounce of soda really worth five minutes of MY time??? (Hint: I’m the person behind you…)

To explain this graphically, the soda below would be inadequate for the people of whom I speak due to the small area near the top of the glass that is not filled with soda.  Obviously ten to twelve carbon dioxide bubbles have burst and need to be replaced by more soda.