Dadadodo is a useful(?) (especially here at E2 ;) utility written by jwz.
From the man page of the program itself:

dadadodo is a program that analyses texts for markov chains of word probabilities and then generates random sentences based on that. Sometimes these sentences are nonsense; but sometimes they cut right through to the heart of the matter and reveal hidden meanings.

Also see http://www.jwz.org/dadadodo/


Here's a sample output. I used the "she does not know how much I need this" node as input, since that was on the top of list of cool user picks right now.

        She whispers.  This way for weeks.  Probably phone call list
        pulled from my green raincoat over her Holding two large
        styrofoams from the round white click Time to this way for
        weeks.  Her arms around me and there She is my pocket, a crumbled
        up paper placemat from her face against the coffee.  I take
        the hook, its She is, my sister. 

        And I give her my pocket, a quiet corridor and there She is my
        eyes; bringing life to this way for weeks.  No answer; weeks;
        me and I can couldn't sleep.  She's out of intensive care
        now.  She's out of intensive care now.  I find a crumbled up
        paper placemat from my green raincoat over her best friends. 
        Look up paper placemat from the resultant shrapnel: sleep;
        leans against the wall, and there She wraps is wearing my
        brother and the end of intensive care now.  The end of
        intensive care now. 

(and it just goes on...)