Research on educational activities generally focuses on the importance of positive emotions in the interaction between teachers and children. This article will focus on the challenging emotions that can arise when kindergarten staff interact with the children. The empirical material has been collected from a qualitative study of conflicts between children and between children and the staff in four Norwegian kindergartens. The focus of the article is limited to children's resistance in conflict situations with staff. The data material is based on the staff's written narratives about their practice and focus-group interviews where they discuss their emotions and actions in events where children demonstrate resistance. The authors discuss how challenging emotions arise in everyday life in kindergarten, reasons for these emotions and how they may affect the development of professional judgment.