The supposed grading advantage of a student that has been scheduled or volunteered to present an oral presentation first (i.e. before anyone else). This comes from the assumption that as the teacher critiques each report, he/she grades the later ones with increasing scrutiny until the last student is doomed to a mediocre grade if the report is any less than perfect (this student has the Last Presenter's Disadvantage).
Jack: "Dude, how did Gracie get a better grade than me? Her voice was like a dying cow and she completely left out Lincoln's involvement in the Civil War."
Danny: "She had the First Presenter's Advantage, man. Plus, yours kind of sucked anyway."