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Just once, I would like to hear you scream, in pain.
— Milo • The Last Boy Scout

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker wants to hear another person cry out in pain. The phrase just once makes the wish sound pointed and insistent, suggesting that this response has not yet been heard. Read as a taunt, the line makes someone else's suffering the desired result.
Context reviewed