Me? I would nurture the grudge. Care for it and feed it. Tend to it every day. And when this couple's children get married, tell them that they will not be receiving a gift from you because of the boorishness of their parents. Then, laugh manically as you run from the room, tightly clutching your bottle of Thorazine to your chest.
If this doesn't work for you, go back and reread Elden's answer.
Jay
