Then, off the coast of Georgia, early on Saturday, April 16, 2005, a giant, seven-story wave appeared out of nowhere. It crashed into the bow, sent deck chairs flying, smashed windows, raced as high as the 10th deck, flooded 62 cabins, injured 4 passengers and sowed widespread fear and panic."
"Rogue Giants at Sea", by W.J. Broad
More on rouge waves at http://en.wikipedia.org/wiki/Rogue_wave