Usually I agree with the moderating, but ...

... on this occasion I'm at a loss. There was an item entitled:

"Unanswerable multiple choice question"

and it was here: http://news.ycombinator.com/item?id=1363393

There was a lively discussion, and it got lots of upvotes. That, of course, of itself does not mean it was on-topic, but the guidelines say:

    On-Topic: Anything that good hackers would find interesting.
              That includes more than hacking and startups.  If
              you had to reduce it to a sentence, the answer might
              be: anything that gratifies one's intellectual
              curiosity.

This particular question was a great example of that last point. Treated carefully it can be used as a starter for paradoxes of all kinds, and self-referential discussions that can lead to correct and appropriate explanations of Goedel's theorems, recursion, formal systems and probability.

I will almost certainly now be using it in my next math club talk, and have already started discussions about it with colleagues in the local university math department.

So why was it killed?

Probably "the judges decision is final" will reign, but I'm annoyed at this one.