Hm! I don't believe you!
5 seconds sound clip from the 13 Style Strike movie soundboard.
You can hear this line at 00:40:48.105 in the DVD version of the movie.
Quote context
[...]
- Oh. What are we going to do?
- Oh, it's up to you. But if you can't hit me, I'll admit defeat. What do you say?
- What kind of Kung Fu is that?
- Oh, it's called the Strong Arm.
- Now, girls, don't be angry. But aren't you going to let me go now?
- Of course we will. But first, there's one condition. You have to teach us Kung Fu. Right.
- Oh, you want to learn it too? All right, I'll teach you.
- Huh? What's the big idea? What's Master playing at? He's forgotten me.
[...]