So, if you ever intend to fight such a man, you'll have to try and find out his weak spot first.

7 seconds sound clip from the Born Invincible (1978) movie soundboard.

You can hear this line at 01:01:59 in the DVD version of the movie.

Quote context

[...]

- Or stay in this cave for the rest of our lives. And live like a pack of rats.

- The body has 108 pressure points. The main ones, 36, minor, 72.

- The most vulnerable: eye, mouth, nose, throat, ear and groin.

- Persons who are experts at Tai Chi kung-fu have only one.

- And that one can be moved and be varied at will.

- So, if you ever intend to fight such a man, you'll have to try and find out his weak spot first.

- And even so, you have to fight very well and need lots of luck too.

- In fact, your chances of winning are quite slim. Most likely you will be killed.

- That's right, my master and my brothers that died at your hands.

- But one day, I'll kill you!

[...]