Ron: Whew, made it. Can you imagine the look on old McGonagall's face if we were late? That was bloody brilliant! Professor McGonagall: Well, thank you for that assessment, Mr Weasley. Perhaps it would be more useful if I were to transfigure Mr. Potter and yourself into a pocket watch? That way, one of you might be on time. Harry: We got lost. Professor McGonagall: Then perhaps a map? I trust you don't need one to find your seats.
Harry and Ron arrive late to Transfiguration, relieved that Professor McGonagall isn't there, but she transform from the cat sitting on her desk.