A blonde, redhead and brunette are all sitting in a hospital's waiting room for ultrasounds.
After a while, the brunette giggles while rubbing her belly. Both the blonde and redhead look over at her and ask, "What's with the giggling?"
The brunette replies, "I'm having a boy!"
The blonde and the redhead ask, "How do you know?"
"Because he was on top!" The brunette replies again.
The three go back to conversing and then the redhead starts to giggle while rubbing her belly.
"What's with the giggling?" The blonde and brunette ask.
"I'm having a girl!" The redhead replies.
"Well, how do you know?" The blonde and brunette ask again.
"I was on top!"
All of a sudden, the blonde bursts into tears.
"Oh, honey! What's wrong?" The redhead and brunette ask.
"I'm having puppies!"