Your Japanese martial arts, are not, in fact, Japanese. They originated in China, where the techniques are the best in the world.

8 seconds sound clip from the Heroes of the East (1978) movie soundboard.

You can hear this line at 00:44:01.267 in the DVD version of the movie.

Quote context

[...]

- Master, you sit down now, huh? Sit down, sit down, huh. Right.

- Right?

- Good. You've made good progress.

- You know, if I hadn't been so busy teaching, you and I would have been married by now.

- Oh, Miss! Letter from Hong Kong for you.

- It's from my husband.

- Your Japanese martial arts, are not, in fact, Japanese. They originated in China, where the techniques are the best in the world.

- Japanese martial arts are very poor, as you ought to know, because I beat you every time.

- But I suppose it's possible you have made progress. And if you have, and you feel you have any chance, then come on back, and let's have a contest.

- It's an insult!

- Teacher... What do we do?

[...]