To prepare for their marriage, Scottish brides-to-be must go through a very foul pre-wedding ritual. Friends of the bride take her by surprise and cover her with eggs, spoiled milk, feathers, pretty much anything disgusting. The blackened bride is then paraded around town. The purpose of this custom is to prepare the bride for marriage because after going through that, any marital problems will seem like nothing.
PS. I am glad that I do not live in Scotland.