A middle-aged couple had two beautiful daughters but always talked about having a son. They decided to try one last time for the son they always wanted. The wife got pregnant and delivered a healthy baby boy. The joyful father rushed to the nursery to see his new son. He was horrified at the ugliest child he had ever seen. He told his wife: 'There's no way I can be the father of this baby. Look at the two beautiful daughters I fathered! Have you been fooling around behind my back?' The wife smiled sweetly and replied: 'Not this time!'