Ask just about any teacher what the most challenging aspect of their job is and, most likely, one of the first answers one will get is "student behaviors!" To date, very little current research has examined the impact of specific challenging behaviors on teachers' job satisfaction. In other words, terms such as "challenging behavior" and "discipline problems" have been used as a catchall for a wide variety of student misdeeds, and only these broad terms have been used in studying the relationship between challenging behavior and teacher job satisfaction. Another point to consider when examining job satisfaction is teacher demographics. However, like job satisfaction and challenging behavior, very few studies have investigated the interactions between challenging behaviors and teacher demographic variables. This paper investigates which challenging behaviors have the greatest impact on public school teachers' job satisfaction and what role specific demographic variables may play in moderating that impact. (Contains 1 figure and 3 tables.)