Because it belongs to the little old ladies!
5 seconds sound clip from the Blackbeard's Ghost (1968) movie soundboard.
You can hear this line at 01:01:59 in the Blu-ray version of the movie.
Quote context
[...]
- Your motives were good, even though your reasoning was perfectly idiotic!
- You regard me strangely, son. Something amiss?
- Money? Money... Oh, the odd flimsy I removed from the purse of your bookish wench.
- Why should that stir your ire?
- Because it belongs to the little old ladies!
- Oh, I can't trust no one. I'll deal with this matter personally.
- Wait a minute. Just how do you figure to do that?
- By bringing a victory in this sport event which is taking place out there this moment.
- Aha! I told you once to keep... Give me that rubbing alcohol!
[...]