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?
- A bust mounted on a pedestal. A bust. A pedestal.
- Where does one usually find a bust mounted on a pedestal?
- Right. Or in a hall of fame.
- Exactly.
- A perfect set up for one of The Joker's jolly crimes.
- This very day the Gotham Museum of Modern Art opened a new exhibit.
[...]