I started in the Random spot and people seem to like it, so I decided to start it here too, only this one will make sense.
We're going to tell a story 5 words at a time.
The first poster will list 5 letters.
The next poster will use those five letters to create either a whole or a parti scentence, then list 5 more letters.
On your turn, you can either create a complete 5 word scentence, stop mid scentence, or end a previous incomplete scentence and start a new one. The only requirement is that you use all 5 listed by the previous poster in order.
Also, it should be relevant to the laid out storyline.
Example (taken from Aminal Farm):
poster 1: TMGAS
poster2: The men gave a shout
poster3: of triumph. They saw, as
poster4: they imagined, their enemies in
poster5: flight, and they rushed after
and so on...