Every story ever told can be broken down into three parts. The beginning. The middle. And the twist!
There's something about a good plot twist: the shock, the awe, the feeling of having your world turned upside down. A good twist might make you see a character in a new light, or rethink everything you thought you knew about the setting. A bad twist, on the other hand, can ruin an otherwise decent story. Bad twists feel cheap and stupid, and make what might have been good, even great stories into muddled and unbelievable messes. So what makes a twist good or bad?