Looks like there's a small bug in the UI: I posted a question here on meta.SE which ended up being just something dumb I was doing and no use to anyone in the future. At first I posted an answer saying what the dumb thing was, but then I realized that the whole thing had no value, so I deleted the answer, and then deleted the question — whereupon it asked me:
Delete this answered question?
We do not recommend deleting questions with answers because doing so deprives future readers of this knowledge.
Repeated deletion of answered questions can result in your account being blocked from asking. Are you sure you wish to delete?
Probably shouldn't ask (or add to the tally) if the only answers are deleted ones...