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Why is there always somebody that brings eggs and tomatoes to a speech?
— The Penguin • Batman Returns

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker asks why eggs and tomatoes seem to accompany speeches so reliably. Read as a complaint about hostile audiences, the question treats the prospect of thrown food as a recurring nuisance. Its humour comes from making that threatening possibility sound like a puzzling habit of attendance.
Context reviewed