- I have it, 5 from 13 is 8.
- How right you are.

8 seconds sound clip from Batman (1966) - Batman Stands Pat (S1E14) TV Series.

You can hear this line at 00:05:38 in the Blu-ray version of the movie.

Quote context

[...]

- There must be some insidious plan. Some overall scheme.

- Who'd steal five hats and five people with them to gain his nefarious end?

- And what did he mean, when he said my cowl would be his 13th hat?

- Did he say that?

- Yes, when I told him I was on to his masquerade.

- I have it, 5 from 13 is 8.

- How right you are.

- Then he must be planning to snatch eight more hats and eight more people.

- Or already has and we don't know about it.

- Yes, Batman.

- Commissioner, have you any more reports of hat thefts or vanishing people?

- As a matter of fact, yes. Word is slowly reaching us that six other fine citizens have disappeared in the last few days. Along with their headwear.

[...]