Because I like to hit you there.
3 seconds sound clip from the Shaolin vs. Lama (1983) movie soundboard.
You can hear this line at 00:20:38 in the DVD version of the movie.
Quote context
[...]
- Why do you have to keep hitting me there for?
- Because I like to hit you there.
- You use your small Kung Fu against me when I know so much? Ha-ha. You're a fool!
[...]