For all of my friends who got married, we come up with a list of questions to ask the groom (i.e. What was she wearing the first time you met? What does she want most on her registry? What habit of yours does she find most annoying?). Then we put together cards on pretty paper with the question on front and the answer on back. Everytime the bride is about to open a gift, the individual who bought the gift asks a question (they are handed out in advance). The bride attempts to guess what the groom said. If she guesses wrong, they are given a piece of gum to chew. The more wrong questions, the more gum in they have to chew (although you can omit this part and we have on occasion). I have seen a version of this game done where the groom is actually filmed while answering the questions and the video is played with each of his responses. This is a lot of work though.
Anyway, this is a great game. It makes the gift opening much more fun and entertaining for guests. But it is a game that the bride really should not be organizing. If you have a friend involved, maybe she can e-mail or meet with your FI to ask the questions and prepare the cards. Often the responses are really quite funny.