Drawing on the Benign Violation Theory, this study examines how two distinct humor styles (affiliative and aggressive) differentially influence employee creativity and constructive voice. We propose that affiliative humor, which frames minor norm violations as benign, enhances creative ideation and encourages employees to speak up with improvement-oriented suggestions. In contrast, aggressive humor, perceived primarily as a threatening violation, is expected to undermine these positive outcomes. To test our model, we conducted a three-wave survey with a one-week gap of 228 employees working in Taiwan. Both humor styles were measured in the first wave, creativity as a mediator in the second, and constructive voice in the third. We also assessed humor appreciation as a moderator at the outset to capture how humor is perceived and received. Process models in SPSS and moderated mediation analyses reveal that affiliative humor is positively related to both creativity and constructive voice. Creativity serves as a mediator in this relationship, and the strength of these effects increases among individuals with higher humor appreciation. In contrast, aggressive humor did not exhibit significant negative relationships with either creativity or constructive voice, indicating that its impact may operate through mechanisms not captured in the present study. Aggressive humor might occasionally be seen as candid or even assertive communication, depending on the cultural and relational context. Thus, its impact on creative expression and voice may be attenuated by these contextual factors. We extended the Benign Violation Theory by integrating both mediating and moderating processes, illustrating how benign appraisals of humor activate cognitive pathways leading to proactive communication. Results highlight the importance of individual differences in humor receptivity, showing that those who enjoy humor more deeply reap greater creative and communicative benefits. Practically, organizations should actively cultivate affiliative humor and consider employees' humor appreciation when designing team interactions and training programs.