We recognize that in the march of the semester we begin on a different note than we end on. The early weeks hold promise and high hopes, both often curtailed when the first assignments are graded. The final weeks find us somewhere between being reluctant or relieved to see a class move on. There is an inexplicable but evident interaction between our teaching persona and the persona a class develops throughout a semester. Some structural factors influence both: among them—the type and level of a course, the discipline, the time of day, and whether the students are a cohort or a unique collection of individuals.