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Here's a quarter. Go downtown and have a rat gnaw that thing off your face.
— Buck • Uncle Buck
Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker turns a personal insult into a mock errand, offering a tiny amount of money for an absurdly vicious remedy. The practical wording clashes with the grotesque suggestion. Calling the target 'that thing' adds contempt while leaving the exact feature unspecified.
Context reviewed