I'm talking about that little twinge in your gut as you write that, hey, something just happened back there. What was that? Did something change without my brain giving the requisite three second notice?

You know. Something began. A turn of phrase by a character or a hint at something in description cracked open some door you didn't even know was there. Seriously, it could be a sign of literary brilliance, so turn around and go see what you did. Can that moment be exploited now? Later? Is it a...