this made us laugh

Two brunettes and a blonde are having lunch at a cafe, all
three are pregnant. Through out the coversation the topic of
sex and pregnancy comes up, finally culminating in each one
discussing their respective fetus' and the manner of
conception.

The first brunette says "I know I am going to have a boy
because I was on top."

The second brunette says "I know I am going to have a girl
because I was on the bottom."

The blonde is silent, she has a stricken look on her face,
finally she bursts out "Oh my god, I'm going to have a puppy."