D&C 59:15; “And inasmuch as ye do these things with thanksgiving, with cheerful hearts and countenances, not with much laughter, for this is sin, but with a glad heart and a cheerful countenance.”

Luke 6:21; “Blessed are ye that hunger now: for ye shall be filled. Blessed are ye that weep now: for ye shall laugh.”

Why would laughter be sinful?