I remember when I was working at the library in circulation (which is not really thought-intensive) and I used to dream up dialogue and plotlines. Plot I could remember, especially after I'd stewed over it for ages, but dialogue I'd worry about forgetting. So I'd write it on these little scraps of paper we keep at the desk, and, since my dress pants didn't have any pockets, I'd fold up the little papers and put them in my shoes. I know, really weird. But it worked. I'd get home, copy the little notes, and toss them away.
