You should've given up while you could. A young pup like you, serious? Ha, I'll fix you!
6 seconds sound clip from the Crippled Kung Fu Boxer movie soundboard.
You can hear this line at 01:14:53.074 in the DVD version of the movie.
Quote context
[...]
- You're not hard enough. Your kung fu's so tame, you could never fly with it.
- I'll put you out of your misery.
- You young bastard, think you're good enough to get me? Ha, we're not in the same league.
- You should've given up while you could. A young pup like you, serious? Ha, I'll fix you!
- Teacher, let me use your stick, it's my only chance! Come and help me!
- Oh, not this time, he won't help you.
[...]