Supplies: Cameras and tripods for each group.
This competition works better with larger groups. You can make this a class competition. (You usually want groups or teams of over 20 for this even to be a challenge.)
Mount a Polaroid (old school method) or digital camera (modern method) on a tripod at a marked spot, aiming at a spot only about 10 feet away. Tape a line that the group can't go behind (keeping them close to the camera)
Explain to each class or team that they must try to fit as many people as possible into the view of the camera. The winner is the team with the most faces in the picture. (Hint: if you use a digital camera, have a way of projecting it on a bigger screen for judging.)
Idea by Young Life