Making the person giving the PA laugh so it comes over the air is not new. Happened in a Virgin cockpit where the captain was teasing the F/O to cause him to giggle during the F/O's PA by momentarily actuating the fire warning test switch causing consternation among the FA down the back when they heard the bell in the background. The time is well overdue for our esteemed Regulator to crack down hard on this childish nonsense. But there again perhaps there is no law against it. But for heaven sake, this peurile attempt at joking would have the comedians thrown off the stage in vaudeville.