This improv game is in the following improv game categories:
Invent a name for a non-existing but simple children`s game. As soon as you
call out the name, all players start to play the game. They can use sounds
and gibberish, but no real language.
See if the group
can come to playing along the same rules.
Just have the group start playing the game, and afterwards have the group
come up with the name.