Going for a trivia database seems like your best bet. I just had a look at www.triviadatabase.com (first google result for "trivia database") and the questions seem relatively neutral in terms of intuitiveness.

"What is the addictive chemical in cigarettes?" "What unit is force measured in?" "What country did King Hussein rule?"

Keep in mind that it's much harder to generate tricky questions than simple ones, so it's unlikely you'll have much cleverness in a big database unless it's extremely expensive.