Half empty or half full? #13

Psychologists use simple tests like this to determine whether a person tends to be an optimist or a pessimist. Optimists will usually say the glass is half-full, whereas pessimists will usually point out that it's half-empty. Optimists tend to focus on the good: there is still water available to drink. Pessimists, on the other hand, see the negative: there is water missing from what otherwise could be a full glass.