A few weeks back, this yes-or-no question got asked and answered by the OP, with the answer YES. I eventually replied NO and my reasoning, and the community votes pended towards my answer. The OP has not accepted an answer.
This question came from another question, on which a very similar thing happened (OP did not agree with most upvoted answer, argued quite extensively with me, and accepted another answer). On the second question, an answer was at least selected.
Is there something we can do in these situations? It seems strange to me that any user can ask a question, answer his own question and (if he wants to) accept his own answer, without any sort of validation. As far as I know, the question can't even be deleted (as it has answers), and it should not be closed (as it might in fact be a good question, such as these both are).
Mind you, I don't want to sound petty, it's not about 15 rep from having the answer accepted or not. It's an actual potential issue I can see with having the community votes to validate answers, but having the OP choose whatever answer he/she wants to.