Why not? For all I know, you could have some blackmail on Monty, too.
6 seconds sound clip from the The Big Knife (1955) movie soundboard.
You can hear this line at 01:28:32 in the Blu-ray version of the movie.
Quote context
[...]
- That she's still at the bar, being entertained by a friend of mine.
- If anything happens to her...
- You're selling fish four days old, kitty.
- Why not? For all I know, you could have some blackmail on Monty, too.
- Your client has to learn how to talk.
- We know who the expert is when it comes to murder.
- Who are you, with your dirty, unmanicured fingernails?
[...]