That's it! Shake hands on that. Now, that's a boy.
5 seconds sound clip from the The Last Gangster movie soundboard.
You can hear this line at 00:49:01 in the Blu-ray version of the movie.
Quote context
[...]
- Come, now. Come, now. Let me tuck you in. We'll play tomorrow.
- Say good night to Uncle Paul.
- No, we got a new one, haven't we, pal? Come on, now, let's show mother. You remember what it is?
- Yeah, yeah, I know, but good night what? Good night...
- That's it! Shake hands on that. Now, that's a boy.
- He and I sort of like it, you know?
- You, uh... sort of talk it over with him, huh?
- Did you talk it over with him, Talya?
- There's a law that will make you automatically free...
[...]

 Phantom of the Opera (1943)
 Phantom of the Opera (1943)  Scooby-Doo, Where Are You! (1969)
 Scooby-Doo, Where Are You! (1969)  Halloween III: Season of the Witch (1982)
 Halloween III: Season of the Witch (1982)  Knight Rider (1982)
 Knight Rider (1982)  Garfield's Halloween Adventure (1985)
 Garfield's Halloween Adventure (1985)