This reminds me of a story my Dad told me! My Dad was a Navy officer, and one of the sailors had received a letter from his wife telling him she just had twins! Thet had been at sea for eighteen months! The sailor was overjoyed! My Dad tried to explain some things to him, and the sailor replied- "O c'mon sir, twins!! It takes nine months for one baby, so it takes eighteen for twins!" My Dad never could convince him about the problem with all that!