We have only one chance.

4 seconds sound clip from Batman (1966) - The Yegg Foes in Gotham (S2E14) TV Series.

You can hear this line at 00:04:25 in the Blu-ray version of the movie.

Quote context

[...]

- Only a bit of information trickled through before that accursed teenager turned the switch.

- And?

- That man has a mind full of trivia. It's inconceivable that he could be Batman.

- Back, back, I say. This is a radar egg! And the slightest vibration will make it egg-xplode and turn this into a room carpeted with wall-to-wall millionaires.

- Let's get out of here. It's two minutes before midnight and the lease is about to egg-xpire.

- Nothing can stop us now.

- We have only one chance.

- This type of mechanism is only sensitive up to about 6 feet.

- Do exactly as I do.

- We just can't leave that bomb there. Some innocent bystander might get hurt.

- Correct. Therefore we must trigger that mechanism before we leave.

[...]