They say that no question is stupid - only answers may be. That would be because ultimately we do not know who we are or how we came to be, and therefore every possible question will have an underlying reason for being asked.

But there's no doubt that some answers can be pretty stupid, and when it comes to idiocy I must say I am adept at giving out retorts ranging from the plain unhelpful to the downright silly.

One case in point is that upon being asked the difference between two things, I tend to pompously give out a "well, it is really not the same" (and only then will I elaborate, supposing I feel literate enough on the subject).

There are plenty other like cases and I would gladly talk till next day, but I think it'd be nicer if you put forth some instances of stupid answers you or people you know gave to completely legitimate questions.