You see, after taking the pill, we blend into the background so perfectly that no one can see us. Not even someone else who takes the pill. That's why we keep bumping into each other.
12 seconds sound clip from Batman (1966) - The Entrancing Dr. Cassandra (S3E25) TV Series.
You can hear this line at 00:05:22 in the Blu-ray version of the movie.
Quote context
[...]
- Miss Gordon, do you have any volumes at the Gotham City Public Library on the occult sciences?
- Perhaps we should take a look at them. Such a tome might open this door to the unknown.
- Good thinking, Batman, but you'll need more than books to vanquish this entrancing foe.
- All right, time for our anti-antidote pill.
- How do these pills work, doc-y baby? Are we really invisible?
- Well, husbands and wives are supposed to bump into each other now and then.
- Now, cut the personal kick. This is business.
- Dug, doc-y baby. But why the hang-up?
- Because I intend to succeed where my foremothers failed.
[...]