don't think we have enough people on this forum to try it, but on this other SF related forum I was on, we had this writing game where each person interested creates a short blurb on a character. Then each of these characters are entered into a deathmatch tournament where they fight each other to the death (i.e. first person makes a post to begin the fight, then the other person responds with their character's actions etc.). Then the fight is over after 2 posts each and everyone votes on who had the more interesting character/fight to proceed to the next round.
anyway, it made for some interesting short story/fight sequences...wizards vs. demons vs. warriors...there was even a shape shifter in there.