I also notice this, it seems the singhs were laughing at the simran being done.
Was a group of about 5 little youngers all in bana laughing a way. A big shame i dont think they were bothered about the surti of the sangath whilst others wanted to concentrate on gurbani, they need to be approached next time or if they are reading to think twice of there action when in guru ji's darbar.
They did namsakar to guru granth sahib by walking around sri guru granth sahib and showed full respect but then wasted there time laughing away and walking in and out of the diwan, all seems to be for show.
Last time when I went down to southall park avenue i also saw some singhs laughing...there where about 5 of them aswell!! lol
maybe the same bunch..
i thought they where laughing at me..lol
but yeah...laughing during keertan/simran and just mucking around playing about..well....lol