No, catch whatsoever. If you shoot those two red balloons, you will be doing Gotham City a gigantic favor.
8 seconds sound clip from Batman (1966) - The Penguin Goes Straight (S1E21) sitcom.
You can hear this line at 00:23:32.750 in the Blu-ray version of the TV Series episode.
Quote context
[...]
- That's too easy. Much too easy. There must be a catch towards somewhere.
- Doing the city a big favor? What the devil? Why not?
- Batman and Robin, a swinging pair of dead ducks!
- What on earth can save them?
- Don't shoot, Commissioner! Don't shoot!
[...]