Then a sudden movement ahead of them made them almost drop the crate. Forgetting that they were already invisible, they shrank into the shadows, staring at the dark outlines of two people grappling with each other ten feet away. A lamp flared.

Professor McGonagall, in a tartan bathrobe and a hair net, had Malfoy by the ear. (scroll down)

"Detention!" she shouted. "And twenty points from Slytherin! Wandering around in the middle of the night, how dare you--"

"You don't understand, Professor. Harry Potter's coming -- he's got a dragon!"

"What utter rubbish! How dare you tell such lies! Come on -- I shall see Professor Snape about you, Malfoy!"