A question asked without expecting an answer, because the answer is already implicit, or because what matters is the doubt it exposes.
In The Posthumous Memoirs of Brás Cubas
what did I find at the bottom of the carriage? My fifty years
The question carries its answer in the same breath, "My fifty years," and what matters is less the doubt than the feigned surprise of someone who already knows what he will find.
Chapters CXVII to CXXXVI: Humanitism, Nhã-loló, and the Fifty Years, the narrator