A blonde, brunette and redhead are at a doctor's office for their first sonograms. The brunette says ""I just know I'm going to be having a boy, I was on top."" The redhead muses ""Oh, then I guess I'm having a girl since I was on the bottom!"" It was at that moment the blonde began to cry hysterically. The other two came closer, put their arms around her and tried to comfort her when she cried out ""Then *I'M* having puppies!""