The first person lays down on the ground, on her back. The next person lays down perpendicular to that one, with her head resting on the first persons belly - and this continues so on and so forth until everyone is laying down -- Then starting with the first person who layed down everyone is given a number, from 1 to the number of people in the group. Then the first person says "Ha!" the second person "Ha Ha", third "Ha Ha Ha" etc etc.. the idea is to get through everyone in the group saying "ha" the number of times as their number without actually laughing. Variations of the game include: going in reverse numerical order and starting in the middle of the group and going from the center out in both directions (with two people doing it at once).