It's a trait of the criminal mind the urge to boast. It often leads to the criminals giving himself away.

9 seconds sound clip from Batman (1966) - The Joker Is Wild (S1E5) TV Series.

You can hear this line at 00:08:11 in the Blu-ray version of the movie.

Quote context

[...]

- A good likeness, but a bad joke.

- Laughing at us for letting him get away.

- It might be more than a joke.

- Batman's right. It could be a clue.

- A clue?

- Sure. The crime wave he's plotting.

- But why would he leave you a clue, Batman?

- He might not mean to.

- It's a trait of the criminal mind the urge to boast. It often leads to the criminals giving himself away.

- A bust mounted on a pedestal. A bust. A pedestal.

- Where does one usually find a bust mounted on a pedestal?

- In a museum.

- Right. Or in a hall of fame.

- Or in both!

- Exactly.

- A perfect set up for one of The Joker's jolly crimes.

- I don't understand, Batman.

[...]