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Presenteeism (showing up for work while sick) is detrimental for employee productivity, yet little is known about its impact on coworkers. Presenteeism may be particularly important when considering coworker reactions that may depend on how similar the sick person is to the coworker. The black sheep hypothesis suggests that the detrimental effects of coworker presenteeism on emotional and behavioral reactions will be exacerbated when there is greater demographic similarity to the perpetrator because the violation of norms of reciprocity, empathy, and concern for others’ well-being reflects negatively on one’s in-group. We tested the black sheep hypothesis in 2 samples:(a) 81 short-term teams (N= 254) where we manipulated presenteeism using confederates who acted as either sick or healthy coworkers and (b) 34 student project teams (N= 104) that collaborated for 3 months and we measured coworker …