This game is played by creating a parallel universe with one difference to this one. The next poster will then state the result due to the difference, and make his/her own universe.
Example:
User 1: There is a parallel universe where people greet each other by smashing their knees together.
User 2: As a result, humans are no longer able to walk. There is a parallel universe where men have breasts.
There is a parallel universe where the sky is bright red.
As a result, Rachel Reagan persuaded madam Gorbachev to tear down the Berlin Wall, while Michael Thatcher censored Nancy Mandela's speeches on British TV. There is a parallel universe where everything is some shade of purple, except for pedalos which are a nasty shade of lurid yellow.
As a result, (Wow, hard one.) The language is modified until the original English is lost to history.
There is a Parallel universe where plants eat other plants to survive. (I know there's Venus Flytrap and all of those other ones, but they eat insects. I'm talking about daisies eating roses and stuff.)