Well, questions that are likely to be perceived as stupid by the general populace. The sort that you ask, and everyone laughs, until somebody with enough Fe says, "Come now, there's no such thing as a stupid question."
I've often found myself asking questions about things that are 'obvious' to everybody else. And I find that when I ask these questions, I don't usually get an adequate response. It's just a regurgitation of what they said before, and if I was asking for clarification, well, how is that supposed to help? You don't clarify things by just repeating them!
I have a feeling that with the way NTs tend to think, they might end up overanalyzing and thus ask these sorts of 'stupid questions.'
So? Familiar experience? Or is this just me?