Quote from : Harry Potter and the Half-Blood Prince Movie

Draco Malfoy: Didn't mummy ever tell you it was rude to eavesdrop, Potter? Petrificus totalus! Oh yeah. She was dead before you could wipe the drool off your chin.
[Stomps on Harry's nose]
Draco Malfoy: That was for my father. Enjoy your ride back to London.
[Covers Harry up with the invisibility cloak and then leaves]