The purpose of this study was to examine students' reports of misbehavior in physical education class. Secondary school participants (N = 2,309) completed a previously validated instrument designed to measure students' reports of 59 student behaviors occurring in classes that might affect class management (e.g., from talking to bringing weapons to class). Three-way repeated measures analysis of variance results suggested that students' reports of misbehaviors occurring in physical education classes differed by gender, grade level, and ethnic background. Chi-square results also suggested there were differences in participants' views about why students misbehave by gender, grade level, and environment. Descriptive findings indicated most student misbehaviors were mild and moderate in nature.