Harry Potter and the Chamber of Secrets2002

Harry:
Mr. Malfoy. Mr. Malfoy! [Lucius turns around] I have something of yours. [Hands him the diary]

Lucius Malfoy:
Mine? I don't know what you're talking about.

Harry:
Oh, I think you do, sir. I think you slipped the diary into Ginny Weasley's cauldron, that day at Diagon Alley.

Lucius Malfoy:
You do, do you? [Hands the diary to Dobby] Well...[Whispers] why don't you prove it? [Harry doesn't answer because he just did] Come, Dobby.

Harry:
[Whispers to Dobby] Open it.

[Dobby opens Tom Riddle's Diary to find a folded sock inside.]

Lucius Malfoy:
Dobby?

Dobby:
Master has given Dobby a sock.

Lucius Malfoy:
What? [Turns around] I didn't give–

Dobby:
[Holding the sock in delight] Master has presented Dobby with clothes! Dobby is free!

[Harry pulls up his pant leg, revealing it was his sock]

Lucius Malfoy:
[Furious] You lost me my SERVANT! [Pulls his wand from his cane and aims it directly at Harry. Dobby then stands in his way]

Dobby:
You shall not harm Harry Potter!

Lucius Malfoy:
[About to curse Harry] Avada– [Dobby blasts him backwards across the hall; Lucius stands] Your parents were meddlesome fools, too. Mark my words, Potter. One day soon, you're going to meet the same, sticky end. [Leaves]

Dobby:
Harry Potter freed Dobby. How can Dobby ever repay him?

Harry:
Just promise me something.

Dobby:
Anything, sir.

Harry:
Never try to save my life again.