Quote from : Harry Potter and the Prisoner of Azkaban Movie

Fat Lady in Painting: [sings while holding a glass] Ah ah ah AH!
Harry: Fortuna Major.
Fat Lady in Painting: No, wait, wait!
[sings again, higher]
Fat Lady in Painting: Ah ah ah AH!
Harry: Fortuna Major.
Fat Lady in Painting: Wait!
[sings again, highest]
Fat Lady in Painting: Ah ah ah AAAAAAAAAAAH!
[holds the note, looks around to make sure nobody's watching, then smashes the glass on the edge of the painting]
Fat Lady in Painting: Oh, amazing! And just with my voice!
Harry: Fortuna Major.
Fat Lady in Painting: Yes, all right, all right, you can go in.
Harry: Thank you!
Fat Lady in Painting: Plebs.