3 expecting mothers were talking in their doctors office, about the sex of their babies. The first mother said, "I'm having a boy." "How can you be so sure?" asked the other two. "Well" said the first, "my husband was on top." The second replied, "If that's the case then I'm having a girl because I was on top." The third started to cry. The first two asked her what was wrong. "I'm going to have a puppy" she replied.