I just had a dream that prompted such a good idea I just wrote a story outline for it.
It's actually science fiction and has a spaceship involved with it (though that's a very marginal point - most of my story idea is centered on earth).
But wow is this a good and (almost) original idea! Some elements of it have been done in varying degrees I think (by Star Trek most memorably - though my twist on the topic matter is different enough). Meanwhile, my take on the story idea is to spin tragic social commentary about it.
But yes, I come up with some good ones from time to time and if I can go somewhere with them, I don't dump them here.