Don't worry about him getting in here. No, sir. Once I get these doors locked, the museum is burglarproof. No one could break into it.
9 seconds sound clip from Batman (1966) - The Joker Is Wild (S1E5) TV Series.
You can hear this line at 00:11:51 in the Blu-ray version of the movie.
Quote context
[...]
- Come on, let's find the director.
- Quick, where do we find the director?
- The administrative annex. Entrance next door, Batman.
- Thanks. Sorry about the early closing.
- Lock it up good. The Joker's on the loose.
- Ready to lock up, Mr. Hovis.
- Coming.
- Come, my comic cohorts in crime.
- Come, Oliver. Come, Stanley.
[...]