vaaheguru ji ka khalsa vaaheguru ji ki fateh
Sorry for jumping into the thread at this point (when it's about to get closed!) but I thought maybe I should share the little bit of knowledge that I have on Gurbani.
First of all, like Japman Singh and Gabroo have pointed out, even laughing would be considered wrong. But if we think about the panktee, we might get a different meaning, which according to me, matches better.
"Nach nach hasse chale se rooe"
Maybe Guru Sahib is refferening to the state of being happy as hasse. Or maybe he is saying that those who enjoy dancing with laughter will weep at their end?
Hasna doesn't only refer to laughter but also it could be used for any mental state when you are in extereme happiness or enjoying something in a blissfull manner.
my two cents..
vaaheguru ji ka khalsa vaaheguru ji ki fateh