I adapted this brainstorming game slightly from an activity in the book Intraemprendizaje by Iñazio Irizar (http://intraemprender.blogspot.com.es/).
1. Players seated in a circle, one person standing in the middle points to a player and says, "C!" The player has five seconds to say a word starting with C. If they miss, they go to the center.
2. In Teams: given a theme or object, people brainstorm words related to that object that begin with C.