The teacher gathers his laughter yoga students from the corners of this tiny studio on the second floor of a downtown Manhattan building. Most of us have never met and from the looks on some faces, aren't quite sure what to expect. "Ha-ha-ha," our laughter sensei begins, clapping along with the cadence. "Ha-ha-ha," we respond, also clapping. "Hee-hee-hee," he continues; we "hee-hee-hee" in obedient reply. Then we begin to meander around the room, clapping and continuing with different variations of the ha-ha-ha, hee-hee-hee chant. When we come face-to-face with someone, we have the option of patty-cake clapping with that person.