Following our recent thread of great (or not) book titles, I've just finished a book entitled The Admiral's Secret Weapon. As I put it down, I suddenly regressed to age 14, and realized with a snigger that the title was a lovely unintentional double entendre.
It could so easily have been the title for a piece of humorous naval erotica. Don't get any ideas: I hereby copyright the idea of using a sailor in erotic fiction, throughout the Universe. (I once signed a copyright transfer form containing that very phrase, and I still feel that I was cheated over the Andromeda Galaxy.)