Long ago, my superior intellect deduced that Batman must be a person who was a millionaire and didn't have to work because crime-fighting is such an eggspensive hobby.
13 seconds sound clip from Batman (1966) - An Egg Grows in Gotham (S2E13) TV Series.
You can hear this line at 00:22:22 in the Blu-ray version of the movie.
Quote context
[...]
- It has occurred to me that one of you is Batman.
- Which one is it, Eggybaby, hmm?
- All of you are approximately the right age, in your early 30s...
- And you, Mr. Savage, are out because of your accent.
[...]