7. Gyroscopic Pool Tables

Even the largest ships are affected by the movement of the ocean, and just the slightest bit of rocking makes it impossible to do things like play pool (oops ... looks like the eight ball already rolled into the corner pocket). The gyroscopic pool tables on Royal Caribbean's Radiance Class ships and on some P&O ships are self-leveling so that whenever the ship moves the table moves, undulating to different degrees in order to keep the balls atop it perfectly still.