- You mean this man with the hat, he killed my uncles, do you know why?
- No, son, I don't really know why.

11 seconds sound clip from the Of Cooks And Kung Fu (1979) movie soundboard.

You can hear this line at 01:20:48 in the Blu-ray version of the movie.

Quote context

[...]

- You must not use your kung fu so freely, not unless it's vital. It's too powerful.

- Grandpa, how are you feeling now?

- Not too bad.

- Grandpa, can you tell me why the man with the hat wants to kill you so badly, and why did he kill uncle too?

- Do you think he's the one that killed my parents?

- Yes, I do.

- Why is that?

- Well, son, the wound on your uncle's neck is identical to the one that killed your parents.

- You mean this man with the hat, he killed my uncles, do you know why?

- No, son, I don't really know why.

- I'll make him pay for these murders.

- Do you remember his kung fu technique?

- I do.

- That will be useful. Copy his style when you attack. He will not expect it.

- But remember this: Don't let him get near you, don't let him get to your throat.

- I've almost succeeded.

[...]