Even though I've asked more than my share of stupid questions, I get frustrated sometimes when the question I'm asking isn't stupid, but the question the that person I'm asking it to THINKS I'm asking is stupid... if that makes any sense.
one example comes to mind from when I was a kid in school (before high school) and the teacher was talking about the fire triangle or something like that. And I asked "why does wood not melt? why doesn't water burn?" ... then the teacher looked at me funny and a horrible silence ran across the room. finally a kid said "water doesn't burn, STUPID." and all the kids started laughing and the teacher chuckled and said "yea, water doesn't burn, anyway..." and went on.
Anyway, point is my question wasn't "does wood melt and water burn?" my question was WHY. Which I don't think is a stupid question, in fact I doubt any of those kids could've answered it.
That's just one example, but that's something that always happens to me. Sometimes a question is only as stupid as the person who answers it.