Is the glass half full or half empty?

This question always bothered me. My answer was neither.

I realise this is a question about our tendency towards optimism or pessimism. I can be both, though tend more toward pessimism. But I also consider myself logical, so that in any given situation I try to identify the likely outcome. Though I admit that if I am called to see my boss I assume (or fear) it is for correction which it almost never is.

But back to the glass. I didn't see the question as legitimate. And it isn't. The answer is neither.

The glass is half full if it is in the process of being poured into, and half empty if it is in the process of being drunken from.