The first player will turn to the next player in the circle and strike a physical pose and make a sound based on that character. Typically, the player will avoid saying legible words. They may sigh, or cough or mumble something. The first player is creating an instantaneous character using the holy trinity of the character (Move, Sound, Want). The second player responds with a character in kind and simply states their relationship.
Each player in this scene will take on the traits of an animal. They will not become the animal, but behave like a human with those animal traits.
Become is Yes Let’s with deeper and deeper expansion. The leader will call out for the players to undertake some mime character. An inanimate object is recommended. For example, everyone become a tree. Once each player has assumed their mimed tree the leader will expand on the details of the noun. It is important for the leader to expand the description in a stepwise fashion that allows the player to respond in a stepwise fashion.