Lay everyone down, one next to each other facing the same direction preferably alternating males and females.
If you have enough people to make more than one line, you can have races between the teams much like in the human zipper game.
Place a quarter on the chest of the first person in line. The aim is to pass the quarter onto the next person without the use of hands. This means that the second person in line must roll on top of the first person with the quarter, both people roll back over again so the second person is again on the bottom and then the first person must roll off, leaving the quarter on the chest of the second person.
In order to keep the quarter between them, the pair must hug each other rather tightly in the rolling process. Should the quarter fall to the ground, they have to start from the beginning again.
Then repeat the game going on down the line.