"And then the ship stops. And the toilets stop working. And everything stinks like a sewer, which is a nice smell to smell when you're already possibly sea-sick. And then, worst of all, you find out that you're surrounded by magicians. What could be worse than a no-way-out floating sewage-smelling magician convention?"
On the up side, consider that people who go on a cruise are people who go on a cruise. How sensitive can they be?