You should've kept your mouth shut anyway. They'd had thought you was a horse and let you out.
5 seconds sound clip from the Scarface (1983) movie soundboard.
You can hear this line at 00:08:07 in the Blu-ray version of the movie.
Quote context
[...]
- Yeah. I told you to tell them you was in a sanitarium, not sanitation. Sanitarium. Yeah.
- No, I told you to say you had TB and you was in a sanitarium. And you was cured.
- You should've kept your mouth shut anyway. They'd had thought you was a horse and let you out.
- Tony! Montana! Tony Montana! Come here.
- Come here, man. I gotta talk to you.
- Come on, man. It's important.
[...]