Sean Connery starred as William of Baskerville at a mature age. Laughter kills fear, and without fear there can be no faith, because without fear of the Devil there is no more need of God. Laughter is a devilish whim which deforms, uh, the face and makes men look like monkeys.
Laughter is particular to men.
As is sin. Christ never laughed. There is nothing in the Scriptures to say that he did. And there's nothing in the Scriptures to say that he did not. Why, even the saints have been known to employ comedy, to ridicule the enemies of the Faith.