The Resurrection of the Lord is the renewal of human nature, and the renewal, re-creation and return to immortality of the first Adam who was swallowed up by death because of sin, and through death went back to the earth from which he was formed.
True joy is the joy of consolation, the joy that wells up in the knowledge of one's own weakness and the Lord's mercy, and that does not need the bared teeth of laughter to express itself.