I hate flashbacks with a fire-y burning passion. Oh, not reading them, but writing them. They always feel unnatural and contrived. They never seem to fit. However, sometimes I have information that is needed, but isn't enough for it's own scene, so... flashback is the easiest way to give it. Normally I avoid them like the plague. But my question is.... how do you write them? Do you jam them in? Low-ball them? How do you build up to them, then bring the reader back out without jarring them too much or interrupting the flow of the story?