On the cruise that I was on back in September (the same one that Corey and Julie were on by the way, but they were rude and wouldn't speak to me) there was a family who showed up for a cruise. It was a couple and both of their extended families. What none of the extended family knew was that the couple had a secret wedding planned for Castaway Cay. They found out the night before when invitations were left in their cabins. He did a full trip report on the thing.
The sad thing is that while his family had no idea, his trip report had let everyone on the DIS know about it. I threatened to tell everyone in his party unless he had a bottle of Dom Perignon waiting for me.