So... while you were standing at the bar and pondering deep questions of fullness and emptiness what I was doing was, I was finishing your drink. Because deep questions - though they're comfortable in bars, as a rule - are nowhere near as vitally important as the question of whether or not you were going to finish this.
So, you know, I finished it for you.
Another round, maybe?
Just one of four carefully crafted answers to that eternal question: Is the glass half empty, or is it half full?