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There was an old lady who swallowed a fly, perhaps she'll die.
— Seth Brundle ‧ The Fly

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The familiar sing-song wording sits uneasily beside the possibility of death. Swallowing something as small as a fly leads to a stark, almost casual conclusion. That contrast between a nursery-rhyme rhythm and a grim outcome gives the quotation its unsettling humor.
Context reviewed