Create a ping pong table and play against your friends or NPCs!
To craft paddles, throw a stick and a wooden pressure plate together on the ground.
To craft the table, throw an iron pressure plate and a redstone repeater together on the ground.
To craft ping pong balls, throw a wooden button together with bonemeal on the ground.
Finally, throw the paddle and the table on the ground together to get the ping pong game!
You can control your paddle by looking left or right. To play against an NPC, simply push a villager into the other side of the table.
A full tutorial can be found here.
And these are some showcases of this command:
The Diamond Minecart