No one can have a higher opinion of you than I have, and I think you're a slimy, contemptible sewer rat.
10 seconds sound clip from the The Great Mouse Detective movie soundboard.
You can hear this line at 00:49:32 in the Blu-ray version of the movie.
Quote context
[...]
- Bravo! Bravo! A marvelous performance.
- Though, frankly, I expected you 15 minutes earlier.
- Trouble with the chemistry set, old boy?
- By the way, Basil, I just love your disguise. Really, one would hardly recognize you.
- The greatest detective in all mousedom!
- Ratigan, so help me, I'll see you behind bars yet!
- You fool! Isn't it clear to you? The superior mind has triumphed. I've won!
[...]