I had your clues wrong but Batman solved them.
5 seconds sound clip from the Batman (1966) TV series - Smack in the Middle (S1E2).
You can hear this line at 00:21:01 in the Blu-ray version of the movie.
Quote context
[...]
- This joke's on you, Riddler.
- When's a donkey spelled with one letter? When it's 'U'.
- Thought we were at the bank, huh?
- We sent the police there as a ruse.
- I had your clues wrong but Batman solved them.
- The fabulous mammoth of Moldavia. With jewels on the outside, and priceless postage stamps inside.
- Get them, boys. Get them or it's curtains.
- The Riddler, watch him. He's running for the rathole.
[...]