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I still maintain that he kicked himself in the balls.
— Kat · 10 Things I Hate About You

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker insists on a version of events and keeps to it: the man injured his own groin by kicking himself there. 'Still maintain' suggests an ongoing disagreement, and the blunt phrasing makes the physical mishap sound both painful and ridiculous.
Context reviewed