The whole group starts off crouched as a ball = egg. They find a partner and play one round of ‘rock, paper, and scissors’. The winner of the round evolves, and the loser stays as they are.
The evolution stages are; chicken = act like a chicken but crouching. Cave man = Act like a caveman. Man = act normal. Wise old man = move to edge of room, stand on a chair, hold your chin and pose wise.