A whole bunch of my dreams get very wacky and I have no idea how I would write a story out of them that would have much coherence behind it. Oh well?
I plan ahead often, or rather I try to. But what I do plan is more of a loose overview of the events, and quite often I change things or more often get more ideas that 'threaten' to take the story in quite a different direction. I didn't have this problem too much in my parody of Colosseum in part because the framework for plot was already there, I suppose, but with some newer stories I'm trying to write in spare time, it's certainly popping up a lot. Which isn't necessarily a bad thing, but it is extending the writing time by quite a bit when I keep thinking new ideas and I don't even have the time to finish writing them up before they change further. :V