The task of identifying the etiological significance of behaviorally abnormal patterns, exhibited by a particular individual, has always been considered a rather challenging one. This is because, even today, the pathogenesis of many mental illnesses remains the subject of continual debates. Nevertheless, it is still quite possible to gain a preliminary insight into what may account for the proper approach towards diagnosing mentally ill persons by the mean of analyzing and classifying the qualitative subtleties of their visually observed behavioral inadequateness. In this paper, I will aim to do just that, while promoting the idea that the symptoms, described in the provided case scenario, suggest that the individual in question (Jack) may, in fact, have suffered from the specific form of mental impairment, commonly known as delirium . According to Duppils and Wikblad, “Delirium is a disturbance of consciousness with reduced ability to focus, sustain or shift attention. Further, it is a change in cognition… that develops over a short period of time” (2004, p. 610). The integral elements of a rationale for me to come up with this preliminary diagnosis can be outlined as follows:  1. As it was mentioned in the case scenario, the concerned 28 years old male began exhibiting abnormal behavior while he was at the restaurant. In its turn, this presupposes the spatially non-continual nature of his illness. This is because the case scenario’s description implies that for some time, prior to the catadrome, this individual was acting in a socially appropriate manner (he would not be able to make it to the restaurant if he was in a delirious state of mind all along). And, as psychiatrists are being well aware of, one of the foremost aspects of how delirium manifests itself in affected people is this mental condition’s spatial briefness and the fact that the severity of associated symptoms fluctuates over the course of time (Schuurmans, Duursma & Shortridge-Baggett 2001).  2. The relevant information, contained in the case scenario, points out to two predisposing factors of delirium , which might have contributed towards the triggering of this mental condition in Jack – his gender affiliation and the contextual possibility that, prior to having started to exhibit the behavioral emanations of delirium , he might have had a few drinks (the scenario of 28 years old male spending time at the restaurant, well after 8 pm, makes this suggestion rather plausible). This assumption is based upon the earlier mentioned logical possibility, which is I consider it appropriate to elaborate on the scenario’s would-be consequences. The factor of gender affiliation concerns the available statistical data, according to which it is specifically males who are being more susceptible to delirium than females (Hare et al. 2008). The second factor refers to the fact that one’s excessive consumption of alcohol has been well proven as such that significantly increases his or her chances to become delirious (Branco 2011).  3. In the provided case scenario, we can also find mentioning of the fact that, one of the reasons why the members of a restaurant’s staff decided to call the ambulance is that Jack appeared abnormally agitated. This gave me another reason to consider that this individual’s visually observable mental abnormality should be discussed wit