‘There are, it has been said, two types of people in the world.
There are those who, when presented with a glass that is exactly half full, say: this glass is half full.
And then there are those who say: this glass is half empty.
The world belongs, however, to those who can look at the glass and say: What’s up with this glass? Excuse me? Excuse me? This is my glass? I don’t think so. My glass was full! And it was a bigger glass!’
Terry Pratchett, The Truth.