half-full or empty

I hate that analogy of whether one is optimistic or not. Waitresses must think we are all pessimists because when one gets to half of a glass, the waiter or waitress will refill ones glass. To me, it depends on whether I'm filling the glass up or drinking the contents as to if it is half full or half empty.

I'm more of a realist. I have half a glass of liquid. it doesn't matter whether I want more or am happy with what I have- it is still only a half a glass of liquid.