This is one forum game that I used to participate in at various places. Every poster posts anywhere between a few words to a sentence per post, the posts forming a story. I have yet to see a resulting story that wasn't weird, atleast somewhat incoherent, and contained plenty of grammar and spelling errors. Concidering the way this community is, I would say there is a good chance of the story becoming exceptionally twisted.
At some point, it will have to end. I'll go by uncyclopedia-esque standards and say that the time has come when the new additions are no longer funny but just stupid. Once agreed that so has happened, I'll assemble the story from the posts.
Also, I might just as well say this now: if it becomes weird and twisted enough once done, I'm going to ask if I can put it on the rather "interesting" humor page of my site as part of the story game collection that currently makes up nearly all of it, along with a link to this forum.
So, I'll begin with:
One day, a madman, grinning ever so maniacally, ...