Teacher knowledge, including Pedagogical Content Knowledge (PCK), continues to be the focus of research, with the general consensus being that PCK impacts upon teaching and learning. Much of the current research has focused on pre-service teachers and practicing primary teachers, with few studies focused on studying senior secondary teachers' PCK. Even rarer are studies which examine PCK from students' perspectives. This study investigates the nature of PCK as experienced in a lesson by a class of senior secondary mathematics students. The findings indicated that there were a number of PCK elements incorporated in the lesson and that these were noticed by the students.