In 4 studies, we investigated the impact of situational experience on social inference. Participants without first-hand experience of a situation made more extreme and erroneous inferences about the personalities of people behaving in that situation than did participants with first-hand experience. First-hand experience, thus, appears to diminish dispositionism in social inference because it informs people about the situational constraints that guide behavior. Across all studies, participants also displayed holier-than-thou biases, overpredicting how generously they would act relative to predictions about their peers and also relative to how they actually acted when the situation came.