Easily the most frequent use of the word rhetoric I encounter:

"It's a rhetorical question"

- taken to meant that the speaker isn't expecting an answer. But nowadays it often means that the speaker isn't about to answer the question for the audience, and neither is the speaker expecting others to think about the question. Whacky, really.

I think [present-day] people who ask rhetorical questions are often asking themselves - but still without expecting an answer.

"Why do I keep doing these things?"

It's more of an exclamation, really. Maybe it should be interrobanged.

What would the adjectival form of interrobang be, BTW?
And this isn't a rhetorical question.