(Police siren wail) Cops!
10 seconds sound clip from Superman (1948) - Irresistible Force (Chapter 9).
You can hear this line at 00:02:22.114 in the Blu-ray version of the episode.
Quote context
[...]
- There's the car, but what's goin' on?
- Looks like our men lost out too.
- We got two of them. They walked right into the trap.
- There was another guy with me here. That reporter, Clark Kent. He was knocked over that...
- Say, you sure play things safe, don't you?
- Usually.
- I'd like to know just how you got that story about Superman stopping a train.
[...]