At a school in Florida, a young woman starts a school presentation talking about her two mothers. An alarm sounds and a red light comes on. The teacher encourages her to continue the exhibition, until the educator herself is called to the reception to be reprimanded. The scene is part of a 30-second ad released last week by the nonprofit Equality Florida as a warning of a dystopian future if a new law, called by its critics "Don't Say Gay", is enacted in the state.