Memories from childrens parties in my youth - the game "the moon is round"
We'd sit in a circle,and pass round a pointer, each had to recite in turn, with suitable actions "the moon is round, it has 2 eyes a nose and a mouth can you do this?" And those in the know would say yes or no. Gradually more and more 'got' it and the actions would get more exagerated.

Then there was the riddle
If the B mt put:
If the B. putting :