My doctor told me I had Type A blood.
But it was a Type O.
But it was a Type O.
'Type O' is a real blood type AND 'typo' — the doctor's blood type announcement was itself a type-O error. The medical mistake becomes literally self-describing, wonderfully and perfectly self-referential.
Pause after 'Type A' with slight concern, then deliver 'Type O' with a resigned shrug — as if blood type errors are just a routine clerical hazard of modern medicine.
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