Origen de la frase “pensando en la inmortalidad del cangrejo”

Origen de la frase “pensando en la inmortalidad del cangrejo”

La frase pensando en la inmortalidad del cangrejo es muy usada en los paises de habla hispana. Sin embargo, a pesar de entender bien a que se refiere, no puedo encontrar el origen de esta frase.

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