Ever wonder why horseshoes are considered lucky and umbrellas opened inside are unlucky? Or where the high five came from? Why brides wear white and mourners black? (It’s not as clear-cut as you think.) This deck of 48 common customs tracks down the origins (or theories, anyway) of things we do every day, even if not everyone the world over does them the same. Drive on the right, or the left? Slurp your soup, or not? And why, oh why, are the buttons on men’s and women’s clothes on opposite sides?! Test your knowledge of these cultural habits and see how many thumbs-ups you get!