have your students get out a pen/pencil and paper, give each student a scenario to start out with. have them read it and write their scenario on the paper, and have them make a lead for their paper.
pass around the paper till it gets back to the owner.
have the owner but his/her name on it.
have the groups decide whos paper is the best or their group, have the students read one paper from each group aloud to the class.