Ok, for some reason I just thought I'd post this up and see how it went. It's very simple, one person creates a scenario in which go set the story and then starts by saying "the good news is....." And gives some good news in the story, which is then counteracted by the next poster, who will say "the bad news is...." And give something bad which would nullify the good news. The next poster must find some good news to overcome the bad news, and so forth.
So, the scenario is that you are a guardsman in a regiment sent to reclaim a strategically important world from the orks which infest it. The good news is your section has drawn non-combatant duties got the first month.