I always find myself fantasising about delivering killer lines in fight situations, even though i've been only in about 3 fights in my life. In any potential situation, even if a dodgy looking group of youths walk past me in the street, i start running through what i'd do. I'd give a speech so fearsome that after i'd beaten up the ringleader his cronies would flee.
I told somebody to "clear off" once, then did the middle finger at him. It's fun to dream.