This paper presents an empirical test of the antecedents and consequences of customer extra-role behavior (i.e., customer citizenship behavior and badness behavior). The model posits that negative affect, perceived justice, and commitment lead to customer extra-role behavior. In turn, such extra-role behavior is expected to impact perceived service quality. The model was tested in an exercise class context of participants at sports center. Results from the empirical test indicated that managing customer extra-role behavior is as important as that of employee. Secondly, the study found that the organization have to manage the negative affect of customers to prevent customer badness behavior, and perceived justice and commitment to increase customer citizenship behavior. Implications are discussed, possible areas of further research are indicated, and limitations of the study are noted.