Perhaps you lived in squalor at some point?
4 seconds sound clip from the Ratatouille movie soundboard.
You can hear this line at 00:56:20 in the Blu-ray version of the movie.
Quote context
[...]
- Thing is, I kind of have to...
- What do you have to more than family? What's more important here?
- Well, I... It wouldn't hurt to visit.
- No.
- Did you work in a lab with rats?
- No.
- Perhaps you lived in squalor at some point?
- You know something about rats! You know you do!
- You know who know do whacka-doo. Ratta-tatta.
- Hey! Why do they call it that?
[...]