Harry Potter and the Half-Blood Prince2009

[Trying to persuade Slughorn, who is drunk, to divulge his true memory]

Harry:
I'm going to tell you something - something others have only guessed at. It's true. I am the Chosen One, only I can destroy him, but in order to do so, I need to know what Tom Riddle asked you all those years ago in your office, and I need to know what you told him. Be brave, sir. Be brave like my mother. Otherwise you disgrace her. Otherwise she died for nothing. Otherwise the bowl will remain empty, forever.

Slughorn:
Please... don't think badly of me when you see it. You've no idea how he was like, even then. [Withdraws memory]