My grandfather's advice

On Sunday evening, Archer called my grandfather to tell him about the pregnancy.  My grandfather, who is 87, said, "Don't you know what causes that yet?"  And then he laughed.  He explained to Archer that he also knows about "surprises."  My mother was born on her older sister's first birthday, so I'm quite certain her arrival was a bit shocking as well.  After a few moments Archer passed the phone to me, and I chatted with my grandfather for awhile. As we were saying good-bye, he gave me one last piece of advice to share with Archer: "Tell him to sleep facing the wall from now on."  He was laughing loudly as he hung up the phone.  I love my grandfather.