The purpose of this critical ethnographic study is to provide an account from within a public school of some of the ways that heterosexist discourses and silences are reproduced and challenged. As a classroom teacher and critical ethnographer, I conducted this research with straight-identified high school students as they came to understand, problematize, and interrupt heterosexism and straight privilege. Unlike many of the students, teachers, and administrators in the school who colluded in the maintenance of heterosexism, through a critical inquiry and student-initiated activism, these students identified as allies and "rocked the boat" to challenge the discourses, silences, and invisibility that supported a heterosexist school culture. (Contains 1 note and 2 figures.)