I don't have a specific situation in mind, it's just that priors from nowhere make me twitch-- I have the same reaction to the idea that mathematical axioms are arbitrary. No, they aren't! Mathematicians have to have some way of choosing axioms which lead to interesting mathematics.
At the moment, I'm stalking the idea that priors have a hierarchy or possibly some more complex structure, and being confused means that you suspect you have to dig deep into your structure of priors. Being surprised means that your priors have been attacked on a shallow level.
What do you mean 'priors from nowhere'? The idea that we're just born with a prior, or people just saying 'this is my prior, and therefore a fact' when given some random situation (that was me paraphrasing my mum's 'this is my opinion, and therefore a fact').
r/Fitness does a weekly "Moronic Monday", a judgment-free thread where people can ask questions that they would ordinarily feel embarrassed for not knowing the answer to. I thought this seemed like a useful thing to have here - after all, the concepts discussed on LessWrong are probably at least a little harder to grasp than those of weightlifting. Plus, I have a few stupid questions of my own, so it doesn't seem unreasonable that other people might as well.