"It needed a week's answer, or none."

It's hard because some of the "easy questions" require a long answer - and sometimes you really ARE in a startup that shouldn't exist (or can't exist yet) - and your friends might be the people who need to pull you out.

But often, if it's someone who is "involved" or interested or even a co-founder, they really do have the question and want to know the answer - or at least be reassured that you've thought about it.

A startup is always in the strange place of trying to do something easy enough that a startup can do it, and hard enough that nobody has done it yet.