The third rule, unspoken, is to not fling your Champagne flutes into the roiling North Atlantic. My wife, Cree, broke this one. It was our second night aboard the ship. We were crossing, in January, from New York to Southampton. I was in black tie. She was in an extraordinary little black dress. We’d been flailing about, in the ship’s ballroom, to an adroit orchestra. We were happy, and tipsy.