Teachers continue to struggle with challenging behaviour, and because of this, many leave the field shortly after being hired. In order to respond appropriately to such challenges, teachers must understand why students misbehave. This case study analysed what four high school teachers considered challenging behaviours in their classrooms. The most prominent challenging behaviours the teachers faced were defiance and attention seeking. Moreover, this study discussed some effective strategies teachers used to stop misbehaviour and increase positive behaviours. Results show that the participants successfully managed challenging behaviours by fostering relationships with their students. Such relationships were built through showing their students they cared about them, creating a positive classroom environment, having private conversations with the students, and talking to their parents.