Musar על ברכות 61:4

And a man should not rejoice to the point of hilarity for now all joy should be mixed with sobriety, for when our "Holy Rabbi" (Rabbi Judah the Prince) used to laugh thus, troubles came to the world (Berakoth 31a). And similarly "Rabbi Jeremiah would bring Rabbi Zera to the point of laughter, but Rabbi Zera did not laugh" (Niddah 23a).

And when should a person rejoice greatly and laugh? When the Divine Presence returns to Zion, for this is a great joy, as it is written "Then will our mouths be filled with laughter and our tongues with song; then will they say among the nations, 'The Lord has done great things with these' " (Ps. 126:2).