Every player is in a grid (adjust size based on number of players/space) with a ball. Players must hold ball away from their body with one hand only. They cannot hold ball against their arm or body. 

One player to start is the "shark" (add more if desired) who is running around trying to knock places balls down, while they try to get away. Any player that loses their ball is out. 

As more players get out, condense space making it more difficult for the players and easy for the sharks.

Players should be constantly checking there shoulders to be on the lookout for the sharks