Watch your mouth, young man.
4 seconds sound clip from the Mrs. Doubtfire movie soundboard.
You can hear this line at 01:07:53 in the Blu-ray version of the movie.
Quote context
[...]
- Lydia, come on! We gotta call the cops! We gotta dial 9-1-1 now! Why?
- Well, Mrs. Doubtfire... he's a she. He's a she-he. He's half-man, half-woman. Yes, I swear.
- Freeze!
- All right, listen to me. I'm not who you think I am.
- Watch your mouth, young man.
- Dad?
- Yeah.
- Dad?
- You don't really like wearing that stuff, do you, Dad?
- Well, some of it's comfortable. No! No. It's a pain in the padded ass.
- You know, it's the only way I could see you guys every day.
[...]