Mulla’s neighbor was throwing a huge dinner party and deliberately didn't invite Mulla. Unfazed, Mulla hatched a plan. Right around dinnertime, he grabbed a blank, empty envelope, walked over to the neighbor’s house, and handed it to the host. Before the confused host could open it, Mulla walked right past him, sat down at the table, and started stuffing his face. The host looked at the blank paper and said, "Mulla, there's nothing written on this." Mulla, mouth full of food, said, "I know. I brought you a blank envelope so next time you can save on postage and not forget to invite me!"