I often start some really really random trains of thought during the day and end up somewhere really interesting. And then I go like "huh. never thought of that before." and 5 min later I totally forgot what it was about.
I should take a recording device with me at all times. Or some papers and a pencil. Those things might do well in a blog. Or a book :P
No, honestly... I sometimes lose myself in a labyrinth of thoughts and end up somewhere over the rainbow. This could probably be a psychological condition and there are pills for it, but I don't really care :)