Yesterday's Irish Times carried this article: a very useful and humorous guide to the various 'isms' and other trivia that we take for granted.
A quick example: Socialism: You have two cows. You give one to your neighbour. Communisim: You have two cows. The state takes both and gives you some milk.
One of my favourites is this one: Surrealism: You have two giraffes. The state requires you to take harmonica lessons.
But my total favourite is this: A French Corporation: You have two cows. You go on strike, organise a riot, and block the roads, because you want three.
Go check out Magpie's whole article.