How would you react if you discovered a classmate cheating?

This honesty-based question is meant to test your character and reveal how you deal with awkward or uncomfortable situations. It is also a test of your integrity. What course did you take when you found yourself in a similar situation? What did you do to help that classmate correct course? Be careful not to name names or throw anyone under the bus, as you can rarely recover from unsavory behavior like that in an interview. Pointing out other's mistakes to make yourself look better rarely succeeds.