Why does the groom carry the bride over the threshold?
The ancient Romans started it: the bride had to show that she was not at all crazy about leaving her father's home, and so was dragged over the threshold to her groom's house. Ancients also believed that evil spirits, in a last-ditch effort to curse the couple, hovered at the threshold of their new home, so the bride had to be lifted to ensure that the spirits couldn't enter her body through the soles of her feet. These days, it's just fun!
Wedding Traditions & Wedding Customs