[I reproduce here Robert Anton Wilson's original exercizes, although I would argue that researching and presenting almost any theory or ideology that most of us would reject also would work -- The Mgt.]
1. Let one member of the group write to the Flat Earth Research Society. Let him or her present to the group some good arguments that the flatness model of Earth fits the facts better than the sphere model.
Let all members attempt to listen calmly, rationally, objectively.
Let all members observe that this attempt to listen without prejudice seems very much more difficult than you would expect in advance.
2. Let another member of the group similarly research and present a defense of Islam (especially its attitude toward women.)
Again, attempt to listen without prejudice, and observe how hard this seems.
3. Let another member research the brilliant scientist Nikola Tesla, father of alternating current grids, and present to the group Tesla's reasons for rejecting Relativity.
4. Let another member research and present the case against Evolution.
Again: More profit will come from doing these exercizes than from merely reading about them.