When the answer make no sense then you figure it out on your own.
When I don't understand the question.
When you doubt the answer, don't understand it, or need more details.
even God said to test Him and to try all things to know the truth ,,,in all things of matter or the human suffering and pain ,,,we should always seek the truth ,,,,but even small thing,, information is power ,,God says his people perish for lack of knowledge ,,if we caused it ,,or didn't heed the warnings He already gave us ,,if we made sure we had the right answers ,we could save our-selfs a lot of pain
I don't know about that but its always enjoyable when you give an answer and the person gives you feedback.
when it comes from authority
when there is no one here to answer it :P
When it does not make sense or it is in contradiction to what you believe.
When you need to query their level of wrongness.