At one time I used to keep notebooks with outlines for stories. But I found doing this somehow deadened the idea in my imagination. If the notion is good enough, if it truly belongs to you, then you can't forget it-it will haunt you till it's written.
If you happen to capture my imagination for some reason and I decide to write about you and you don't like what I wrote about you, which is entirely possible, then yes, I'm a dangerous writer.