Originally Posted by
Darkmatters
I've done it in many non-lucids - any time I find myself on a rooftop or a very high place I guess I can tell it's a dream and I jump off, feeling a rush of joy as I do it. Then I always end up flying in some way or other - sometimes right away, sometimes just before I hit the ground. Yes, like eldante says, bravery is key.
Put it this way, if you're standing on a rooftop and thinking that if you jump off you might actually be able to fly, then you can pretty well bet you're dreaming. Unless you've been taking acid or something.