The only one I remember at all was an old broken down actor on our first cruise. Alan Kent on Sitmar's Fairwind, later Princes.
Shortly after the cruise he was arrested coming into LA harbor because of his connection to a counterfieting ring out in the Valley. I guess he was carrying the bills out of the country, but we never heard how it came out.
There was a young couple at our table whoose cruise was paid by their "uncle", he was a treasury investigator.