"Is it worse being stupid, or is it worse having a sneaking suspicion that you might be stupid?"
"Is this a personal thing?"
"Of course not! I'm curious."
"About stupid people?"
"So you're not worried that maybe you're stupid and unaware of the fact?"

"Of course you wouldn't really know would you?"
"Whether you were stupid or not."

"Gee thanks. I think you've answered my question."
"You're stupid?"
"No. You are, but you don't realise it yet."