Guest-contact employees interact with various types of customers, and they are often exposed to stressful conditions caused by the deviant, or jay-customers. The purpose of this study is to examine how jay-customer behaviors (customer incivility and customer aggression) affect employees’ job stress, and consequently, job satisfaction. Surveys of 210 participants, currently working as guest-contact employees in the hospitality industry, were analyzed for the study. The results of hierarchical multiple regression analyses show a positive relationship between the experience of customer incivility and employees’ job stress. Additionally, the results indicate a full mediation effect of employees’ job stress on the relationship between customer incivility and employees’ job satisfaction. Unfortunately, the study was not able to analyze customer aggression, because the majority of the participants did not report customer aggression. The findings of this study make a contribution to the hospitality service management literature by providing empirical evidence of customer incivility and its negative impact on guest-contact employees. Hospitality managers should acknowledge the existence of jay-customer behaviors and recognize their significant impact on employees’ job stress and job satisfaction