What do you do when you have a 20-minute recess, one ping-pong table and 11 kids who want to play?
You play "rundpingis", round-table ping pong. Form a queue on each side, the person at the front hits the ball, then runs to queue on the other side. Maybe you just play on indefinitely, or maybe you get kicked out when you miss, and the last person standing is the winner.
You can do this with only 3 people, a very short queue of one person, and intense running. 😇