This is a game for at least 2 players, though 3 is probably the realistic minimum. The rules for n players are as follows.
Now you've got a manually-created text with some Markov chain-like properties (because people have imperfect memory, and the text has many authors) and some human-written text properties. To bump up the Markov chain quality, reduce how many words of the string each player is allowed to see. Sat May 24 2008 09:02 Make Your Own Markov Chain:
As per Fafner's request, here's a Surrealist-style word game I made up, the textual equivalent of the Exquisite Corpse. It probably already exists but you get what you pay for.