Unprofessional behaviors among health care workers can impede safety culture and harm patients and colleagues. In this study, researchers examined 2,504 reports of positive and unprofessional coworker behavior over a three-year period at one Australian hospital. The most commonly reported positive behaviors included non-technical skills, values-driven behavior, and actions that enhanced patient care delivery. Frequently reported unprofessional behaviors included being rude, humiliating or ridiculing others, and ignoring others’ opinions.