You did it. You did it on purpose.
4 seconds sound clip from the Cinderella (1950) movie soundboard.
You can hear this line at 00:21:12 in the Blu-ray version of the movie.
Quote context
[...]
- Well, come in, child, come in.
- Pick up the laundry and get on with your duties.
- Oh! Oh, Mother. Oh, Mother! Mother! Mother!
- You did it. You did it on purpose.
- Oh! She put it there. A big, ugly mouse, under my teacup.
- All right, Lucifer. What did you do with him?
[...]