The belief that a full moon or Friday the 13th or some specific doctors are associated with busier shifts in the emergency room is still widespread among caregivers. Although such a topic may seem anecdotal, even folkloric, it has been the subject of several studies that have shown that there is no association between these factors and the number of emergency room admissions or type of pathology. It is not certain that an evidence-based approach is sufficient to eliminate such beliefs because their existence also responds to an attempt to put some semblance of meaning into the chaotic and stressful activity of emergencies.