It's a colloquial use, probably as close to a hypothetical question as anything.
Most often it's done in speaking, where the question is understood by voice intonation, with the answer coming immediately after.
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"The gift which I am sending you is called a dog, and is in fact the most precious and valuable possession of mankind" -Theodorus Gaza
Baby Jesus cries when the fat redneck doesn't have military-grade firepower.
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