The wedding traditions of Scotland are rich and colorful. From the wooing and courting, through the Scottish wedding ceremony, and on into the home, the traditions abound with blessings, hilarity, and such Scottish-ness.
In Scotland, there is a particularly nasty pre-wedding tradition that involves the bride and groom being pelted with food trash, including rotten eggs and fish. The Scots believe that if a couple can withstand this, their marriage can withstand anything.
Source: http://www.scottish-wedding-dreams.com/wedding-traditions.html, http://www.lifebuzz.com/marriage-customs/