Old man, you stay out of this if you know what's good for you.
7 seconds sound clip from the Sleeping Fist (1979) movie soundboard.
You can hear this line at 00:30:21 in the DVD version of the movie.
Quote context
[...]
- I'm gonna finish with you two for good.
- Goddammit, I was having such a comfortable sleep, but you bastards have woken me up, you have.
- Look, will you do me a favor? If you must fight, go do it someplace else.
- Old man, you stay out of this if you know what's good for you.
- Goddammit, he sure knows his kung fu.
- Well, what the hell you waiting for?
- Goddammit, this guy really does know his kung fu.
[...]