Tim O'Brien describes the way war stories are told and their reliability in his work "How to Tell a True War Story". As a Vietnam War veteran, O'Brien describes the nature of a war front and how people perceive experiences on the war front differently. In her essay "When I Woke Up Tuesday It Was Friday" Martha Stout discusses self-dissociation from case studies of her patients. Dissociation is the disruption of psychological functioning; Trauma is a major cause of dissociation. Jean Twenge explains how younger generations describe narcissistic behavior, and how the media and other factors fuel narcissistic behavior in society, in her text "An Army of One: Me". When there is an extreme level of external pressure on a person, that individual will try to get rid of that pressure using any coping technique. A soldier's war story is like his personal memory of history; tells how he perceived the story instead of what actually happened. Likewise, narcissists and dissociated people have different types of perception than other people. Narcissists expect more respect from others and think they deserve more than others. Dissociated people perceive a reality different from that of others and think that their perception is real. The main reason for having different types of perception is that people face some experiences in their life which can change or shape their personality. They see the world through these personalities. However, people cannot change their personalities for every new experience. Therefore, if people face a new world they have never encountered, they will perceive the world in the way their experiences guide them. However, if people's expectations are not met in the reality of... middle of paper expectations. This will make that person focus only on meeting expectations. However, narrowing goals just to meet expectations does not provide practical knowledge of life. It will make people's lives like a machine that works according to a particular algorithm. If people face failure when progressing through their highest expectations, they may not be able to stop for a while and introspect, as they run in the fast pace of expectations, fail to see the reality or even do not have enough time to see the reality. . If people have higher expectations they will be reluctant to fail in a trial; therefore, they will not learn anything carefully. This causes lack of concentration in reality. Limiting expectations will give a clear idea of ​​what is happening in reality. This will make life more realistic and successful.