A woman is giving birth. She pushes and pushes and finally the baby pops free. The doctor holds the baby up by its feet and declares, "it's a handsome baby boy!"
He then punches it in the head, throws it against the wall and runs over and jumps on it with both feet.
The horrified mother screams, "my baby! You're killing my baby!"
To which the doctor replies, "I'm just fucking with you. It was already dead."