Welcome to Fight Club. The first rule of Fight Club is: you do not talk about Fight Club. The second rule of Fight Club is: you DO NOT talk about Fight Club! Third rule of Fight Club: someone yells "stop!", goes limp, taps out, the fight is over.
This picture shows a girl deciding which of her multiple masks on the wall to put on. This demonstrates that a person can possibly have more than one mask, whether it be with family, friends or strangers.