this scene from last year's harry potter and the deathly hallows part 2 is certainly one of my all-time favorites from the movie franchise. badass professor minerva mcgonagall versus headmaster snape! wish it was longer in the movie. the other video is also of the same scene from the movie, but from a video game.
severus snape: now, should anyone, student or staff, attempt to aid mr. potter, they will be punished in a manner consistent with the severity of their transgression. furthermore, any person found to have knowledge of these events, who fails to come forward, will be treated as equally guilty.
harry potter: [to snape] tell them how it happened that night. how you looked him in the eyes, a man who trusted you, and killed him!
minerva mcgonagall: [to snape] coward!