Yesterday, I came across this infamous question: https://puzzling.stackexchange.com/questions/10466/the-traveler-and-the-blood-thirsty-troll?rq=1
I agree that it should be the OP's discretion to select a best answer to his question, but for the community as a whole, the chosen answer seems wholly unhelpful.
Is there a way to deselect the answer if it's got enough downvotes(or even a single downvote)? If not, will it be a good idea to add such functionality?