Well, you're not get a thing out of me 'cause I know how to keep a secret. Compared to a clam, I am an oyster.
7 seconds sound clip from The Honeymooners (1955) - The Bensonhurst Bomber sitcom.
You can hear this line at 00:15:18.716 in the Blu-ray version of the TV Series.
Quote context
[...]
- What are you gonna tell her when you go out of town? What?
- I don't know. I'll think of something.
- Eh? Oh, nothing, nothing. Nothing at all.
- Nothing?
- Ed, what are you talking about?
- What am I talking about? Wouldn't you like to know? That's for me to know and you find out.
- I'm not gonna tell a thing because my lips are sealed.
- Some guys in the neighborhood are blabbermouths, but not me.
- Remember during the war? That expression, 'a slip of the lip will sink a ship'? I never sank one.
[...]