I have a weakness for using humor in public addresses. Sometimes the laughter is constant and heavy [at which point people suggest an alternative career in standup comedy. But since stand up comedy is almost always הוללות and ליצנות for the pure sake of הוללות and ליצנות I pass]. I then ask myself if this is permitted, for Chazal said that one may not "fill one's mouth with laughter" [ימלא אדם שחוק פיו] in this world. It requires a broad discussion to define what the paramters of this issur are.
I accidentally found this heter from a Chabad source. Not being a diehard Chabadnik, I can't say that it flies for me....
