Teachers' responses to language classroom incidents depend on many factors, including the extent of their teaching experience. The question of how much influence teaching experience carries is important given that pre-service teachers have had limited opportunities to respond to day-to-day incidents that arise in classrooms. This paper reports on a two-stage research study in Singapore that first explored 22 pre-service teachers' understandings of language classroom incidents and their possible responses. Subsequently, a survey was conducted to compare pre-service and in-service teachers' perceptions about anticipating and responding to classroom incidents. The findings from a total of 77 respondents indicate that perceptions of the experienced and inexperienced teachers are similar in many ways, yet some notable differences emerged as well as a few interesting individual responses. This work has implications for initial teacher education programmes in terms of considering the value of providing pre-service teachers with opportunities to discuss and reflect on potential language classroom incidents.