I'll put down a few scriptural examples for you that laughter can be a good thing.
Ecclesiates 3:1-4 (ESV) - 1 For everything there is a season, and a time for every matter under heaven: 2 a time to be born, and a time to die; a time to plant, and a time to pluck up what is planted; 3 a time to kill, and a time to heal; a time to break down, and a time to build up; 4 a time to weep, and a time to laugh; a time to mourn, and a time to dance;
Psalm 126:1-3 (ESV) - 1 When the Lord restored the fortunes of Zion, we were like those who dream. 2 Then our mouth was filled with laughter, and our tongue with shouts of joy; then they said among the nations, “The Lord has done great things for them.” 3 The Lord has done great things for us; we are glad.
Luke 6:21 (ESV) - Blessed are you who are hungry now, for you shall be satisfied. “Blessed are you who weep now, for you shall laugh.
Proverbs 17:21 (ESV) - A joyful heart is good medicine, but a crushed spirit dries up the bones.
(Boldness added for emphasis.)