We make a square of benches with +/- 15 balls in it.
2 players go into the square and the rest of the players stand around it.
The players in the square get 60 seconds to throw as many balls as possible out of the square, it is up to the other players to throw as many balls back into the square.
After the 60 seconds the balls in the square are counted and then it's up to the next 2 players.
(In between there is a rest period of about 60 seconds).
The duo that has the least balls in the square at the end has won.
The others do a punishment (for example clean up the balls and the benches.