“…and who knew?” or “…,and, who knew…” or “…, and who knew…”?

Maybe by joining that religion I’d be able to understand myself, and
who knew?
Maybe I’d find the meaning of life.

Maybe by joining that religion I’d be able to understand myself, and,
who knew,
maybe I’d find the meaning of life.

Maybe by joining that religion I’d be able to understand myself, and
who knew,
maybe I’d find the meaning of life.

What the most grammatical choice? If all of them are, what’s the most commonly used?

Answer

Using the wikipedia page provided by Mari-Lou A http://en.wikipedia.org/wiki/Rhetorical_question#Negative_assertions

It is a rhetorical question, so it needs it’s own sentence. Based the example given on the page, (Smoking can lead to lung cancer. Who knew?!), I’d say that the correct way express it would be:
“Maybe by joining that religion I’d be able to understand myself. And who knew? Maybe I’d find the meaning of life.”

That isn’t to say that: “Maybe by joining that religion I’d be able to understand myself, and who knew? Maybe I’d find the meaning of life.” is incorrect but there definitely needs to be a question mark if you are asking a rhetorical question.

Attribution
Source : Link , Question Author : janoChen , Answer Author : Magari96

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