In Math 152, Professor Paul Bamberg and his co-teacher structured the class in a seminar format, where students did mini-lectures for each other in class and critiqued each other content as well as style.
In Jerusha Achterberg's first and second Expos workshops of the semester, she chooses two paper drafts from the section and all the other students read and comment on those two papers. The authors also serve as the moderators for each other's discussion.
John Maynard Keynes classic "Beauty Contest" had people choose from a set of faces which they thought would be considered the six most beautiful. Winners were chosen from those who chose the most popular face. This easy task replicates the experiment with a simple numbers game.
Are people predisposed to favor their own groups at the expense of others, even when the group distinction is completely arbitrary? This activity replicates, more or less, the exact experiment used by Henri Tajfel to demonstrate the "minimal group paradigm" used in Social Identity Theory.