Are you convinced?
2 seconds sound clip from the Heroes of the East (1978) movie soundboard.
You can hear this line at 00:33:43.220 in the DVD version of the movie.
Quote context
[...]
- Don't fight! Don't fight! Stop fighting.
- It's called Carrying the Water in Chinese boxing.
- Also, your pole is too short. You'll lose.
- Why are you hiding? You admit you're beaten? Come out!
- Look... What are those clothes? Are they yours?
- This is a special technique. It's Ninjitsu. When it's mastered, it's real hard to beat.
- Just now, I was just playing. I mean, if I had been serious then you'd be dead now.
- If I'd have put poison in it too, then you'd have died.
[...]