~ Laughing during Salah ~

1. If an adult laughed during any Ruku-and-Sujood-containing Salah with so much
voice that those around him heard his voice of laughing, then both his Wudu and
Salah would become invalid If he laughed with as much voice as only he heard it.
then his Salah would become invalid but Wudu would remain valid. Smiling would
neither invalidate Salah nor Wudu. (Maraqi Fahd, pp.91) Only the teeth of the smiling person appear without any voice at all.

2. If an adult laughed loudly during a funeral Salah, his Salah would become invalid
but Wudu would remain valid. (Ibid)

3. Laughing when not offering Salah does not invalidate Wudu but repeating it is
Mustahab. (Ibid, pp.84) Our Beloved and Blessed Prophet صلى الله عليه وسلم never
laughed. Therefore, we should not also laugh loudly, attempting to revive this
Sunnah.