I was asked to review this and this answer and found that they were totally not answers, there were a lot of upvotes each, however. They were deleted by a moderator, but is it allowed and encouraged to post non-answer joke to low-quality questions in MSE?
Posting joke non-answers is not within the scope of the site, so we will delete them(1) when they come to our attention.
Typically, they don't do much harm, though, so usually the poster faces no dire consequences beyond having the answer deleted. But if somebody posts enough such joke posts that they become a nuisance, further consequences are on the table.
(1) When they're really funny, we will shed a quiet tear.
Allowed, maybe, but discouraged, I hope. If someone has the time to post a joke non-answer, don't they also have the time to post a bona fide answer? I think that if the question is so bad it doesn't merit a real response, then it doesn't merit any answers period. It should be deleted.