I think we're going to need another feather over here, Professor.
5 seconds sound clip from the Harry Potter and the Sorcerer's Stone movie soundboard.
You can hear this line at 01:10:45 in the Blu-ray version of the movie.
Quote context
[...]
- Besides, you're saying it wrong. It's Leviosa, not Leviosar.
- You do it then, if you're so clever. Go on, go on.
- Oh, well done! See here, everyone, Miss Granger's done it! Splendid!
- I think we're going to need another feather over here, Professor.
- She's a nightmare, honestly! No wonder she hasn't got any friends.
- Parvati Patil said that she wouldn't come out of the girl's bathroom.
[...]