According to folklore, a knife signifies a broken relationship and is bad luck to give as a wedding gift. If knives are on your registry, just give the gift giver a penny. That way it's a purchase, not a gift.

Wearing a Veil

This custom originated in Rome, when a bride would wear a veil down the aisle to disguise herself from evil spirits who were jealous of her happiness.

 Carrying the Bride Over the Threshold

This superstition began in Medieval Europe where many believed that a bride was extra vulnerable to evil spirits through the soles of her feet. To avoid bringing in any evil spirits, the groom carried the bride into their new home.