As I was telling you, The Riddler had someone impersonate me today.

6 seconds sound clip from Batman (1966) - When the Rat's Away the Mice Will Play (S1E12) TV Series.

You can hear this line at 00:18:14 in the Blu-ray version of the movie.

Quote context

[...]

- I played along with the hoax because Bruce Wayne was present. I didn't wanted to expose him to any danger.

- Good for you. You did exactly as you should have done.

- Did he give you any instructions? Fine. You do just what he says.

- In the meantime, I'll map out a plan.

- What was it?

- As I was telling you, The Riddler had someone impersonate me today.

- I knew he'd get careless if he thought we were out of the way.

- But how do we stop him?

- The clinch here would be to solve this last riddle: 'Why is a woman in love like a welder -I bet that'll tell us the location of the bomb alright.

- Well, stop fiddling with that atomic pile and come down here.

[...]