Get a group of about 20 or so players. Get two sets of players to go to the goal posts. Split them up so there are one set of players on each goalpost. Send one group of players to the corner of the eighteen yard box and send the last set of players to the other end of the eighteen. Have one of the groups by the post pass the ball to the group diagonal of them. That group then passes it to the group directly in front of them. That group than passes it to the group diagonal of them. The group that last recieves the ball will take a one-time shot on net. Keep in mind the passing is done as on-timers also.