“Didn't Mummy ever tell you it was rude to eavesdrop, Potter?...” – Draco Malfoy, Harry Potter and the Half-Blood Prince ... Movie Quotes Database

[Alone in his compartment on the train with Harry hiding under the Cloak; quietly]

Didn't Mummy ever tell you it was rude to eavesdrop, Potter? Petrificus Totalus! [Harry falls, still hidden] Oh, right. She was dead before you could wipe the drool off your chin. [Kicks Harry in the face, breaking his nose] That's for my father. Enjoy your ride back to London. [Covers Harry with the cloak]

More from Harry Potter and the Half-Blood Prince

Horace Slughorn All right, I'll do it! But I want Professor Merrythought's old office, not the water closet I had before. And I expect a raise, these are mad times we live in. MAD! Professor McGonagall Potter, take Weasley with you. He looks far too happy over there. Arthur Weasley Times like these, dark times, they do funny things to people. They can tear them apart.