I shouldn't have told you that.
4 seconds sound clip from the Harry Potter and the Sorcerer's Stone movie soundboard.
You can hear this line at 01:58:03 in the Blu-ray version of the movie.
Quote context
[...]
- And did he seem interested in Fluffy?
- Well, of course he was interested in Fluffy.
- How often do you come across a three-headed dog, even if you're in the trade?
- But I told him. I said, the trick with any beast is to know how to calm him.
- Take Fluffy, for example. Just play him a bit of music and he falls straight to sleep.
- I shouldn't have told you that.
- We have to see Professor Dumbledore. Immediately!
- I'm afraid Professor Dumbledore is not here.
- He received an urgent owl from the Ministry of Magic and left immediately for London.
- He's gone? Now? But this is important! This is about the Philosopher's Stone!
[...]