A couple has two beautiful daughters. They also want to have a son and so they decide to get a third child.

 The wife gets pregnant and the baby is a little boy. The father is completely happy and drives to the hospital as quickly as possible in order to see his son.

When he sees the child, he becomes pale because he is the ugliest child that he ever
saw.He says to his wife: "I can't be the father of this boy. Just look
at our beautiful daughters. You definitely had an affair with another man!"