Wedding Programs

I was recently asked by a bride-to-be about wedding programs. What are wedding programs and do we need them?
Wedding programs are not required, but they are a welcome addition to the wedding ceremony. Usually the names of the parents and grandparents are listed. Also listed are the names of the bridal party. Sometimes there are details about the bridesmaids and groomsmen. It's an extra touch to know the relationship between the bridesmaids and the bride, groomsmen and groom. You can make it simple, stating Sally is a friend of the bride, or more elaborate with how long they have been friends, where and when they met, college roommates, etc.
If one is unfamiliar with the protocol of a particular wedding, it will help to know what is coming next in the ceremony for when to stand and/or sit. The music to be played and names of the composers are also listed. Deceased relatives can be listed with a special remembrance. The bride and groom usually thank their parents, relatives and friends for attending their special day.
Any unusual programs that you have seen??