Time for another great writing post by Susan J. Morris on the Omnivoracious blog:
When you tell a story with a twist, you are taking on the role of the Trickster. As the reader’s sole experience of your story is in your authorial hands, we readers kind of expect you to tell it to us straight. So when you take that trust, then give the story a twist, you’re tricking us! [...] But, of course, as many a Trickster has learned the hard way, you have to be careful when playing the Trickster, because while we may love to be tricked, we hate being made to look foolish.
Susan describes a few archetypical twist styles with examples, so click through to read the rest: http://www.omnivoracious.com/2011/12/tell-it-like-a-trickster-how-to-write-a-good-twist.html