A well respected surgeon was relaxing on his sofa one evening just afterarriving home from work. As he was tuning into the evening news, the phonerang. The doctor calmly answered it and heard the familiar voice of acolleague on the other end of the line."We need a fourth for poker," said the friend."I'll be right over," whispered the doctor.As he was putting on his coat, his wife asked, "Is it serious?""Oh yes, quite serious," said the doctor gravely."In fact, three doctors are there already!"