A large group of people gather together inside or outside. All the players sit or lie down and start uttering sounds resembling orgasm - the first in the group makes it once, the second - twice and so on. And nobody must laugh at himself or at another person. If somebody bursts out laughing, the game is started from the beginning.
The game may be recorded on a video or audio tape. It will be very funny to watch or listen to it after the game and give a neighing laugh together.
How do you like my idea?