Why Did Robinson Crow So?

Even Robinson Crusoe had to add good Friday to Christmas to make it a success—otherwise it would have got his goat. He knew that you can't get that festive feeling by shaking hands with yourself and saying “here's how” to the scenery.

Even Crusoe couldn't do so,
Never man that ever grew so.
Christmas spirits won't rebound,
'Less you “shout” and hand them round.