If you watch the season 2 eps, you will noticed that there is a lot of foot stumping by the members in the audience. I guess since the show was still new at the time, members in the audience could not control their laughter.


You never heard that type of Laughing after season 2 from the audience.


Episodes you can hear this in are

Windfall
J.J Gang-1
Debutante Ball
Dinner Party