In this unique introductory lesson, teachers use the example of a hypothetical "lunchroom fight" to introduce students to the approach and disciplines they will use in the Reading Like a Historian curriculum, sourcing and corroboration in particular. Students pretend to be a principal who must debrief many different witnesses - students, teachers, etc. - to the fight. In groups, students answer guiding questions: why might there be so many versions of the truth? What might make 1 witness more/less believable than another? In a group discussion, the teacher connects this type of analysis to the students' upcoming study of historical primary sources.