And has been gummed, if I'm not in error by a bat who has been drinking Rodent's Delight...

10 seconds sound clip from the The Great Mouse Detective movie soundboard.

You can hear this line at 00:38:39 in the Blu-ray version of the movie.

Quote context

[...]

- Fidget, you delightful little maniac.

- You've presented me with a singular opportunity.

- Poor Basil! Oh, he is in for a little surprise.

- Offhand, I can deduce very little. Only that the words are written with a broad-pointed quill pen which has spattered, twice.

- That the paper is of native Mongolian manufacture, no watermark.

- And has been gummed, if I'm not in error by a bat who has been drinking Rodent's Delight...

- A cheap brandy sold only in the seediest pubs.

- Hmm. Amazing.

- Oh, not really, doctor.

- We still don't know where it came from. Perhaps a closer inspection will tell us something.

- Mmm-hmm. Hmm. Mmm-hmm. Coal dust. Clearly of the type used in sewer lamps.

[...]