But be careful. Don't get knocked unconscious or you'll all materialize again.

8 seconds sound clip from Batman (1966) - The Entrancing Dr. Cassandra (S3E25) TV Series.

You can hear this line at 00:20:15 in the Blu-ray version of the movie.

Quote context

[...]

- Well, darlings, we get 50 percent of everything you steal, but in return, I provide camouflage pills and protection.

- And don't worry about Batman, Robin or Batgirl. They've made their last scene.

- Here are your pills, darlings. Pass them around, love. One to a customer.

- With pleasure, doc-y baby.

- Now, you'll blend into the background for eight hours.

- After that, come back with the loot and I'll give you all another dose.

- But be careful. Don't get knocked unconscious or you'll all materialize again.

- You foolish, foolish woman.

- Quick, swallow the pills.

- They're gone.

- Well, how can we fight them if we can't see them?

- We may not be able to see them, but I have the feeling they're still here.

[...]