I've seen a couple Questions go by in the past where the user asked the question, then answered it immediately.
Often, these questions were simple, a little bit more elaborated than this example:
How can I smurf?
The posted Answer was effectively answering the question.
However, there is this text when we hover the downvote button:
This question does not show any research effort [...]
So, even if the user answered their Question, the Question per se does not show any research effort (at least in the cases I've seen), which would mean that they'd be quite downvotable.
Do we have a stance on this?