I've had them "pick an ending" lucid dreams. I found that if it goes one way, I can try it another way, or another. I figure to it being coming out of deep sleep but deep enough to dream hard but yet have some control over the action. Sometimes I feel like a writer-director in a live action movie.

It rates up there with the having to pee dreams where you dream you have to pee so you are in a bathroom, finish, but still have to pee, repeat.- hope you wake up before you pee yourself awake.

Maybe being such a head case have anything to do it? Idk, but it's a pretty kewl way to waste your time.