is a mental attitude. Pessimists anticipate undesirable outcomes from a given situation, which is generally referred to as situational pessimism, or believe that undesirable things are going to happen to them in life more than desirable ones. Pessimists also tend to focus on the negatives of life in general or a given situation. The most common example of this phenomenon is the "Is the glass half empty or half full?
" situation. In this situation a pessimist is said to see the glass as half empty while an optimist is said to see the glass as half full. Throughout history, the pessimistic disposition has had effects on all major areas of thinking.